Types Of Microorganisms! Hardest Trivia Quiz
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Disease-causing microorganisms are called
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Decomposers
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Prokaryotes
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Pathogens
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Eukaryotes
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About This Quiz
Explore the challenging world of microorganisms with our 'Types of Microorganisms! Hardest Trivia Quiz'. Delve into the roles and characteristics of microbes, including pathogens, decomposers, and prokaryotes, and their applications in biotechnology. Ideal for enhancing understanding in microbiology.
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- 2.
The microorganisms that recycle nutrients by breaking down dead matter and wastes are called
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Decomposers
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Prokaryotes
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Fermenters
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Pathogens
Correct Answer
A. DecomposersExplanation
Decomposers are microorganisms that play a crucial role in ecosystems by breaking down dead matter and wastes. They break down organic material into simpler forms, releasing nutrients back into the environment. This process, known as decomposition, is essential for nutrient cycling and the overall health of the ecosystem. Prokaryotes are a type of microorganism that lack a nucleus, but not all prokaryotes are decomposers. Fermenters are microorganisms that carry out fermentation, a metabolic process that does not involve oxygen, but they are not specifically involved in nutrient recycling. Pathogens are microorganisms that cause diseases and are not involved in the decomposition process.Rate this question:
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- 3.
The microorganisms that do not have a nucleus in their cell wall are called
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Decomposers
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Prokaryotes
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Pathogens
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Eukaryotes
Correct Answer
A. ProkaryotesExplanation
Prokaryotes are microorganisms that do not have a nucleus in their cell wall. They are single-celled organisms that lack membrane-bound organelles, including a nucleus. Prokaryotes include bacteria and archaea. They have a simple cellular structure and are capable of various functions such as decomposition, nitrogen fixation, and photosynthesis. Unlike eukaryotes, which have a nucleus and other membrane-bound organelles, prokaryotes have their DNA floating freely in the cytoplasm. Therefore, prokaryotes are the correct answer to the question.Rate this question:
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- 4.
The Dutch merchant who made and used quality magnifying lenses to see and record microorganisms was
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F. Redi
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A. Leeuwenhoek
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L. Pasteur
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J. Lister
Correct Answer
A. A. LeeuwenhoekExplanation
Leeuwenhoek is the correct answer because he was a Dutch merchant who made and used quality magnifying lenses to see and record microorganisms. He is considered one of the pioneers of microbiology and is known for his meticulous observations and accurate drawings of microorganisms, which he made using his handmade lenses. His discoveries greatly contributed to the understanding of the microscopic world and laid the foundation for the field of microbiology.Rate this question:
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- 5.
Koch's postulates are criteria used to establish that
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Microbes are found on dust particles
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A specific microbe is the cause of a specific disease
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Life forms can only arise from preexisting life forms
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A specific microbe should be classified in a specific kingdom
Correct Answer
A. A specific microbe is the cause of a specific diseaseExplanation
Koch's postulates are criteria used to establish that a specific microbe is the cause of a specific disease. These postulates were developed by Robert Koch and are still widely used in microbiology to determine the causative agent of a disease. According to Koch's postulates, the microbe must be present in all cases of the disease, it must be isolated from the diseased individual and grown in pure culture, it should cause the same disease when inoculated into a healthy individual, and it must be re-isolated from the newly infected individual. These steps help establish a causal relationship between a specific microbe and a specific disease.Rate this question:
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- 6.
The outcome of the gram stain is based on differences in cell's
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Ribosomes
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Inclusions
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Cell wall
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Cell membrane
Correct Answer
A. Cell wallExplanation
The outcome of the gram stain is based on differences in the cell wall. Gram staining is a technique used to differentiate bacteria into two groups: Gram-positive and Gram-negative. Gram-positive bacteria have a thick peptidoglycan layer in their cell wall, which retains the crystal violet stain, giving them a purple color. On the other hand, Gram-negative bacteria have a thinner peptidoglycan layer and an outer membrane, which does not retain the stain, resulting in a pink color. Therefore, the cell wall plays a crucial role in determining the outcome of the gram stain.Rate this question:
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- 7.
The fossil record has est. that prokaryotes existed on earth for approx 2 billion years before eukaryotes appeared
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True
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False
Correct Answer
A. TrueExplanation
The explanation for the given correct answer is that the fossil record, which consists of preserved remains or traces of organisms from the past, has provided evidence that prokaryotes, which are single-celled organisms without a nucleus, existed on Earth for approximately 2 billion years before eukaryotes, which are organisms with a nucleus, appeared. This evidence supports the statement that the given statement is true.Rate this question:
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- 8.
Which activity is an example of biotechnology?
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Bacteria in the soil secreting an antibiotic to kill competitors
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A microbiologist using the microscope to study bacteria
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Humans using yeast to make beer and wine
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Mycobacterium tuberculosis in the lungs causing TB
Correct Answer
A. Humans using yeast to make beer and wineExplanation
Using yeast to make beer and wine is an example of biotechnology because it involves the use of living organisms, in this case yeast, to produce a desired product. Biotechnology refers to the use of biological systems, organisms, or their components to develop or create useful products or processes. In this case, yeast is used to ferment sugars and produce alcohol, which is then used to make beer and wine.Rate this question:
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- 9.
The primary purpose of staining cells on a microscope slide is to
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Kill them
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Secure them to the slide
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Enlarge the cell
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Add contrast in order to see them better
Correct Answer
A. Add contrast in order to see them betterExplanation
Staining cells on a microscope slide is done to add contrast, which helps in visualizing the cells better. By using specific dyes or stains, the cells can be highlighted and differentiated from their surroundings, making it easier to observe their structure, morphology, and any abnormalities. This contrast enhancement enables researchers and scientists to study and analyze cells more effectively under a microscope.Rate this question:
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- 10.
Microorganisms are best defined as organisms that
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Cause human disease
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Lack cell nucleus
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Are infectious particles
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Are too small to be seen with the unaided eye
Correct Answer
A. Are too small to be seen with the unaided eyeExplanation
Microorganisms are best defined as organisms that are too small to be seen with the unaided eye. This definition encompasses a wide range of microscopic organisms such as bacteria, viruses, fungi, and protozoa. These organisms play a crucial role in various ecosystems and have both beneficial and harmful effects on human health and the environment.Rate this question:
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- 11.
These bacteria are small gram neg, obligate intracellular parasites and they tend to alternate between two forms elementary body and reticulate body
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Chlamydia
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Option 2
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Option 3
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Option 4
Correct Answer
A. ChlamydiaExplanation
Chlamydia is the correct answer because it matches the given description of being small, gram-negative, obligate intracellular parasites that alternate between two forms - elementary body and reticulate body. Chlamydia is a genus of bacteria that includes several species known to cause various infections in humans and animals.Rate this question:
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- 12.
_____ organelles in algae and plants are known to have evolved from cyanobacteria by the process of endosymbiosis.
Correct Answer
chloroplastExplanation
Chloroplasts in algae and plants are believed to have evolved from cyanobacteria through endosymbiosis. Endosymbiosis is a process where one organism lives inside another and both benefit from the relationship. In this case, it is believed that cyanobacteria were engulfed by a host cell and eventually became chloroplasts. This theory is supported by the fact that chloroplasts have their own DNA, similar to cyanobacteria, and can carry out photosynthesis, a process that cyanobacteria are also capable of. Therefore, the correct answer is chloroplast.Rate this question:
- 13.
Why is immersion oil often used when viewing specimens under the microscope
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To stain the cells blue
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To prevent smear from drying out
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To slow bacterial movement so you can see cells better
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To increase the resolution
Correct Answer
A. To increase the resolutionExplanation
Immersion oil is often used when viewing specimens under the microscope to increase the resolution. Immersion oil has a similar refractive index as glass, which reduces the amount of light that is scattered or refracted as it passes through the specimen and the microscope lens. This reduction in scattering and refraction allows more light to be collected by the lens, resulting in a clearer and more detailed image. By using immersion oil, the resolution of the microscope is improved, allowing for better visualization and analysis of the cells or organisms being observed.Rate this question:
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- 14.
What is the correct sequence for gram stain?
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Gram' iodine, crystal violet, alcohol, safranin
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Crystal violet, safranin, alcohol, gram's iodine
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Crystal violet, gran's iodine, alcohol, safranin
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Option 4
Correct Answer
A. Crystal violet, gran's iodine, alcohol, safraninExplanation
The correct sequence for the gram stain is crystal violet, gram's iodine, alcohol, safranin. This staining technique is used to differentiate bacteria into two groups: gram-positive and gram-negative. Crystal violet is the primary stain that colors all bacteria purple. Gram's iodine is the mordant that forms a complex with crystal violet, making it more resistant to decolorization. Alcohol is the decolorizing agent that removes the crystal violet-iodine complex from gram-negative bacteria, leaving them colorless. Safranin is the counterstain that stains gram-negative bacteria pink, allowing them to be differentiated from the gram-positive bacteria.Rate this question:
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- 15.
Spontaneous generation is the belief that
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Germs cause infectious diseases
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Microbes are diverse and ubiquitous
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Microbes placed in an infusion can grow in it
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Living things arise from nonliving matter
Correct Answer
A. Living things arise from nonliving matterExplanation
The belief of spontaneous generation states that living organisms can arise from nonliving matter. This theory was widely accepted in the past, as people observed the apparent emergence of organisms from decaying matter or stagnant water. However, this belief was later disproven by experiments conducted by Louis Pasteur and others, which demonstrated that living organisms only arise from preexisting living organisms through processes such as reproduction or germination.Rate this question:
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- 16.
This bacterium causes a commonly acquired sexually transmitted bacterial disease and Trachoma, the most common cause of blindness
Correct Answer
ChlamydiaExplanation
Chlamydia is the correct answer because it is a bacterium that is known to cause both a commonly acquired sexually transmitted bacterial disease and Trachoma, which is the most common cause of blindness. Chlamydia is transmitted through sexual contact and can cause infections in the genital tract, leading to symptoms such as discharge, pain, and infertility. Additionally, if left untreated, Chlamydia can spread to the eyes and cause Trachoma, a chronic infection that can lead to blindness. Therefore, Chlamydia fits the description provided in the question.Rate this question:
- 17.
Which bacterium was the first organisms to produce oxygen as a byproduct of photosynthesis
Correct Answer
CyanobacteriaExplanation
Cyanobacteria were the first organisms to produce oxygen as a byproduct of photosynthesis. They are a group of bacteria that are capable of photosynthesis and have the ability to convert sunlight into energy. Through this process, they release oxygen into the atmosphere, which played a crucial role in the evolution of life on Earth. Cyanobacteria are often referred to as blue-green algae, but they are not true algae. They are found in various environments, including freshwater, marine, and terrestrial habitats.Rate this question:
- 18.
A microbiologist makes a fixed smear of bacterial cells and stains them with methylene blue. all the cells appear blue under the oil lens. this is an example of
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Negative staining
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Using an acidic dye
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Simple staining
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Using acid-fast stai
Correct Answer
A. Simple stainingExplanation
In this scenario, the microbiologist made a fixed smear of bacterial cells and stained them with methylene blue. The fact that all the cells appear blue under the oil lens suggests that the stain is uniformly coloring the cells, without any contrast or differentiation. This indicates that the staining technique used is simple staining, where a single dye is used to color all the cells in a sample.Rate this question:
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- 19.
The most immediate result of destruction of a cell's ribosomes would be
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Material would not be able to cross cell membrane
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Protein synthesis would stop
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Destruction of cell's DNA
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Formation of glycogen inclusions
Correct Answer
A. Protein synthesis would stopExplanation
If a cell's ribosomes are destroyed, the most immediate result would be that protein synthesis would stop. Ribosomes are responsible for translating the genetic information from DNA into proteins, so without functioning ribosomes, the cell would not be able to produce proteins.Rate this question:
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- 20.
Endospores are
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Metabolically inactive
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Resistant to heat and chemical destruction
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Resistant to destruction by radiation
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Living structures
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All of the choices are correct
Correct Answer
A. All of the choices are correctExplanation
Endospores are a unique form of bacterial survival structures that are metabolically inactive, meaning they are not actively carrying out any metabolic processes. They are also highly resistant to heat, chemical destruction, and radiation. This allows them to withstand harsh environmental conditions such as extreme temperatures, exposure to chemicals, and high levels of radiation. Therefore, the correct answer is that all of the choices are correct.Rate this question:
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- 21.
When humans manipulate the genes of microorganisms the process is called
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Bioremediation
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Genetic engineering
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Epidemiology
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Immunology
Correct Answer
A. Genetic engineeringExplanation
Genetic engineering refers to the process of manipulating the genes of microorganisms, plants, or animals to produce desired traits or characteristics. This can involve inserting, deleting, or modifying specific genes to enhance their functions or create new ones. Bioremediation, on the other hand, is the use of microorganisms to clean up pollutants in the environment. Epidemiology is the study of diseases and their patterns, while immunology focuses on the immune system and its response to diseases. Therefore, genetic engineering is the correct answer as it specifically relates to the manipulation of genes in microorganisms.Rate this question:
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- 22.
Using microbes to break down and remove toxic wastes in water and soil is called
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Decomposition
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Synergism
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Mineralization
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Bioremediation
Correct Answer
A. BioremediationExplanation
Bioremediation is the process of using microorganisms to break down and remove toxic wastes in water and soil. This technique takes advantage of the natural ability of certain microbes to degrade or transform harmful substances into less toxic forms. By introducing these beneficial microbes into contaminated areas, bioremediation can help restore the environmental balance and reduce the harmful effects of pollutants.Rate this question:
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- 23.
Which of the following is present in gram positive and gram negative cell wall
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Outer membrane
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Teichoic acid
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Peptidoglycan
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Lipopolysaccharides
Correct Answer
A. PeptidoglycanExplanation
Peptidoglycan is present in both gram positive and gram negative cell walls. It is a polymer made up of sugars and amino acids that provides structural support to the cell wall. Gram positive bacteria have a thick layer of peptidoglycan, while gram negative bacteria have a thinner layer surrounded by an outer membrane. Teichoic acid is only present in gram positive cell walls, and lipopolysaccharides are only present in gram negative cell walls. Therefore, the correct answer is peptidoglycan.Rate this question:
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- 24.
The function of bacterial endospores is
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To convert gaseous nitrogen to a usable form for plants
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Reproduction and growth
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For protection of genetic material during harsh conditions
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Storage excess cell materials
Correct Answer
A. For protection of genetic material during harsh conditionsExplanation
Bacterial endospores serve the purpose of protecting the genetic material during harsh conditions. This is achieved by forming a tough outer layer that shields the DNA and other essential components from extreme temperatures, radiation, desiccation, and harmful chemicals. The endospores allow the bacteria to remain dormant and survive in unfavorable environments until conditions become favorable again for growth and reproduction.Rate this question:
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- 25.
If microbiologist is studying a specimen at a total mag of 950x, what is the magnifying power of the objective lens if the ocular lens is 10x
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100x
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950x
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850x
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95x
Correct Answer
A. 95xExplanation
The magnifying power of a microscope is determined by multiplying the magnification of the objective lens by the magnification of the ocular lens. In this case, the ocular lens has a magnification of 10x. Since the total magnification is given as 950x, we can divide 950 by 10 to find the magnification of the objective lens. This gives us a magnifying power of 95x for the objective lens.Rate this question:
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- 26.
This bacterium has a life cycle that includes elementary and reticulate bodies
Correct Answer
ChlamydiaExplanation
Chlamydia is the correct answer because it is a bacterium that has a unique life cycle involving two distinct forms: elementary bodies and reticulate bodies. The elementary bodies are the infectious form that can survive outside the host, while the reticulate bodies are the replicative form that multiply within host cells. This life cycle allows Chlamydia to successfully infect and reproduce in various host organisms, causing a range of diseases such as sexually transmitted infections and respiratory tract infections.Rate this question:
- 27.
Positive stain use two or more stains it is referred to as _____ stain
Correct Answer
differentialExplanation
When a positive stain uses two or more stains, it is referred to as a differential stain. Differential stains are used to differentiate between different types of microorganisms or different parts of a microorganism. This staining technique allows for the visualization and distinction of specific structures or components within the microorganisms, helping in their identification and classification.Rate this question:
- 28.
Which microscope achieves the greatest resolution and highest magnification
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Bright-field
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Dark-field
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Phase-contrast
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Electron
Correct Answer
A. ElectronExplanation
The electron microscope achieves the greatest resolution and highest magnification among the options given. Unlike light microscopes, which use visible light to magnify and resolve images, electron microscopes use a beam of electrons. Electrons have a much shorter wavelength than visible light, allowing for higher resolution and greater magnification. This enables electron microscopes to visualize extremely small structures and details that would be impossible to see with other types of microscopes.Rate this question:
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- 29.
A prokaryotic cell wall that is primarily peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is
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Gram-negative
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Gram-positive
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Archaea
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Spheroplast
Correct Answer
A. Gram-positiveExplanation
A prokaryotic cell wall that is primarily composed of peptidoglycan with small amounts of teichoic acid and lipoteichoic acid is classified as gram-positive. Gram-positive bacteria have a thick layer of peptidoglycan in their cell walls, which retains the crystal violet stain during the Gram staining process, causing them to appear purple under a microscope. Teichoic acid and lipoteichoic acid are unique components found in the cell walls of gram-positive bacteria, further supporting this classification. Gram-negative bacteria, on the other hand, have a thinner layer of peptidoglycan and an outer membrane, which makes them appear pink after the Gram staining process. Archaea have a different cell wall composition and structure compared to bacteria, and spheroplasts are bacterial cells that have had their cell walls partially or completely removed.Rate this question:
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- 30.
Enzymes are
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Broken down in reactions that requires energy input
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Proteins and some are RNA that function as catalysts
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Only proteins used up in chemical reactions
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Only RNA and not needed for catabolic reactions
Correct Answer
A. Proteins and some are RNA that function as catalystsExplanation
Enzymes are proteins and some are RNA that function as catalysts. Proteins and RNA can both act as enzymes, facilitating and speeding up chemical reactions. Enzymes work by lowering the activation energy required for a reaction to occur, thereby increasing the rate of the reaction. They are not used up in the reactions they catalyze and can be reused multiple times. Therefore, the correct answer is that enzymes can be proteins and some are RNA that function as catalysts.Rate this question:
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- 31.
The majority of reduced NAD/NADH is produced in
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Glycolysis
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Krebs cycle
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ETC
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Photosynthesis
Correct Answer
A. Krebs cycleExplanation
The Krebs cycle, also known as the citric acid cycle, is a series of chemical reactions that occur in the mitochondria of cells. This cycle is an essential part of cellular respiration, which is the process by which cells convert glucose into energy. During the Krebs cycle, reduced NADH is produced through the oxidation of glucose and other molecules. This reduced NADH carries high-energy electrons that are used in the electron transport chain (ETC) to generate ATP, the main energy currency of the cell. Therefore, the majority of reduced NAD/NADH is produced in the Krebs cycle.Rate this question:
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- 32.
Organisms called parasites are
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Always classified in the kingdom monera
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Maybe harmful to their host
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The decomposers in ecosystems
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Always viruses
Correct Answer
A. Maybe harmful to their hostExplanation
Parasites are organisms that live in or on another organism (host) and obtain nutrients from the host, often causing harm in the process. They rely on the host for survival and reproduction, which can lead to negative effects on the host's health and well-being. Therefore, parasites may be harmful to their host.Rate this question:
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- 33.
Gram stain, acid-fast stain, and endospore stain
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Used on a wet mount of the specimen
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Use heat to force the dye into cell structures
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Have outcomes based on cell wall differences
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Are differential stains
Correct Answer
A. Are differential stainsExplanation
Gram stain, acid-fast stain, and endospore stain are all examples of differential stains. Differential stains are used to distinguish between different types of cells or cell structures based on their physical or chemical properties. In this case, these stains are used to differentiate between different cell wall structures. The staining process involves using heat to force the dye into the cell structures, allowing for better visualization and differentiation.Rate this question:
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- 34.
This bacterium is a member parasite that adheres to and damages the mucous membrane of the respiratory, urinary, and reproductuve tracts
Correct Answer
MycoplasmaExplanation
Mycoplasma is a bacterium that is known to be a member parasite, as it adheres to and causes damage to the mucous membranes of various tracts in the body, including the respiratory, urinary, and reproductive tracts. This bacterium lacks a cell wall, which allows it to attach to and invade the host's cells, leading to infection and subsequent damage. Mycoplasma infections can result in a range of symptoms depending on the affected tract, including respiratory issues, urinary tract infections, and reproductive problems.Rate this question:
- 35.
The transfer of genes during bacterial conjugation involve rigid, tubular appendages called
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Flagella
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Cilia
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Fimbriae
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Sex pili
Correct Answer
A. Sex piliExplanation
Bacterial conjugation is a process where genetic material is transferred between bacterial cells through direct contact. During this process, the transfer of genes is facilitated by the presence of rigid, tubular appendages called sex pili. These sex pili help in establishing physical contact between the donor and recipient bacterial cells, allowing for the transfer of genetic material. Flagella are whip-like structures used for bacterial movement, cilia are short hair-like structures used for movement or sensing, and fimbriae are short, hair-like appendages used for attachment to surfaces. None of these structures are directly involved in the transfer of genes during bacterial conjugation.Rate this question:
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- 36.
The term that refers to the presence of flagella all over the cell surface is
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Amphitrichous
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Atrichous
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Monotrichous
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Peritrichous
Correct Answer
A. PeritrichousExplanation
Peritrichous refers to the presence of flagella all over the cell surface. This means that the flagella are distributed evenly around the cell, allowing it to move in any direction. Amphitrichous refers to the presence of flagella at both ends of the cell, atrichous refers to the absence of flagella, and monotrichous refers to the presence of a single flagellum. Therefore, peritrichous is the correct term to describe the presence of flagella all over the cell surface.Rate this question:
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- 37.
All of the following are correct about slime layer, except
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It is a type of glycocalys
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It can be easily washed off the cell
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It protects the cell from loss of water and nutrients
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It plays a roll in cell motility
Correct Answer
A. It plays a roll in cell motilityExplanation
The slime layer is a type of glycocalyx that surrounds the cell and protects it from the loss of water and nutrients. It forms a sticky layer that can be difficult to wash off the cell. However, it does not play a role in cell motility.Rate this question:
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- 38.
CO2 IS
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Removed from atmosphere during photosynthesis
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Source of carbon
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Returned to atmosphere during respiration and fermentation
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Used by marine organisms to make limestone for their hard shells
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All of the above
Correct Answer
A. All of the aboveExplanation
The correct answer is "all of the above". This means that CO2 is removed from the atmosphere during photosynthesis, it is a source of carbon, it is returned to the atmosphere during respiration and fermentation, and it is used by marine organisms to make limestone for their hard shells.Rate this question:
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- 39.
Oxidation of ammonia (NH4+) to nitrate (NO3-) is called
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Ammonification
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Nitrogen fixation
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Photosynthesis
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Nitrification
Correct Answer
A. NitrificationExplanation
Nitrification is the correct answer because it is the process by which ammonia (NH4+) is oxidized to nitrate (NO3-). This process is carried out by two types of bacteria: ammonia-oxidizing bacteria that convert ammonia to nitrite (NO2-) and nitrite-oxidizing bacteria that convert nitrite to nitrate. Nitrification is an important step in the nitrogen cycle, as it converts ammonia, which is toxic to many organisms, into a less toxic form that can be utilized by plants for growth. Ammonification, nitrogen fixation, and photosynthesis are not related to the oxidation of ammonia to nitrate.Rate this question:
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- 40.
Which of the following IS NOT an example of biofilm
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Single bacterial cell growing on an agar surface
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Toilet bowl scum
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Organisms that colonies indwelling medical devices
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Dental plaque
Correct Answer
A. Single bacterial cell growing on an agar surfaceExplanation
The correct answer is "single bacterial cell growing on an agar surface." This is because biofilms are communities of microorganisms that adhere to surfaces and form a protective matrix. In contrast, a single bacterial cell growing on an agar surface does not form a biofilm as it does not involve the formation of a community or a protective matrix.Rate this question:
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- 41.
Identification of bacteria require a study of all but which of the following
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Microscopic and macroscopic morphology
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Bacterial physiology
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Quantitative analysis
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Serological analysis
Correct Answer
A. Quantitative analysisExplanation
To identify bacteria, a study of their microscopic and macroscopic morphology is necessary to observe their physical characteristics. Bacterial physiology helps understand their metabolic processes and behavior. Serological analysis involves studying the antibodies produced in response to bacterial antigens. However, quantitative analysis refers to the measurement and analysis of quantities or amounts, which may not be directly relevant to identifying bacteria. Therefore, it is not required for the identification process.Rate this question:
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- 42.
Which scientist discovered heat resistant bacterial spores
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J. Lister
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R. Koch
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F. Cohn
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A. Leeuwenhoek
Correct Answer
A. F. CohnExplanation
Ferdinand Cohn is credited with discovering heat resistant bacterial spores. He was a German biologist and botanist who made significant contributions to the field of microbiology. Cohn conducted extensive research on bacteria and was the first to describe and classify bacterial endospores, which are highly resistant to heat and other adverse conditions. His work on spore formation and resistance laid the foundation for understanding the survival mechanisms of bacteria and their ability to withstand extreme environments.Rate this question:
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- 43.
The rash and/or hemorrhage associated to Rocky Mountain spotted fever and Typhus occur when this bacterium targets the endotheilal cells that line blood vessels
Correct Answer
RickettsiaExplanation
Rickettsia is a bacterium that causes diseases such as Rocky Mountain spotted fever and Typhus. These diseases are characterized by a rash and/or hemorrhage. The explanation for the correct answer is that Rickettsia specifically targets the endothelial cells that line the blood vessels. This leads to damage and inflammation of the blood vessels, resulting in the symptoms observed in patients with these diseases.Rate this question:
- 44.
The conversion of gaseous nitrogen (N2) to ammonium (NH4+) occurs during
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Ammonification
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Nitrogen fixation
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Photosynthesis
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Nitrification
Correct Answer
A. Nitrogen fixationExplanation
Nitrogen fixation is the process in which gaseous nitrogen (N2) is converted into ammonium (NH4+). This process is carried out by certain bacteria, either free-living or symbiotic, which have the ability to convert atmospheric nitrogen into a form that can be used by plants and other organisms. Ammonification, on the other hand, is the process of converting organic nitrogen into ammonium, while nitrification is the process of converting ammonium into nitrate (NO3-). Photosynthesis is the process by which plants convert sunlight into energy, and it does not involve the conversion of nitrogen. Therefore, the correct answer is nitrogen fixation.Rate this question:
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- 45.
Type of microscope in which you would see bright illuminated specimens against a black background is
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Bright field
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Dark field
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Phase-contrast
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Fluorescene
Correct Answer
A. Dark fieldExplanation
In a dark field microscope, the specimens appear bright and illuminated against a black background. This is achieved by using a special condenser that blocks direct light from reaching the objective lens. Instead, only light that is scattered or refracted by the specimen enters the objective lens, creating a contrasting image. This technique is particularly useful for observing transparent or unstained specimens, as it enhances their visibility and allows for better examination of their fine details.Rate this question:
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- 46.
What does a positive stain color
Correct Answer
specimen - 47.
Glycocalyx is
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Capsule
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Pili
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Outer membrane
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Cell wall
Correct Answer
A. CapsuleExplanation
The correct answer is capsule. The glycocalyx is a layer of polysaccharides that surrounds the cell wall of some bacteria. It can exist in two forms: capsule and slime layer. The capsule is a well-organized and tightly bound layer that helps protect the bacteria from the host's immune system and allows them to adhere to surfaces. It also helps in the formation of biofilms. Pili are hair-like structures that help in bacterial attachment and conjugation. The outer membrane is a unique feature of gram-negative bacteria. The cell wall provides structural support and protection to the bacterial cell.Rate this question:
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- 48.
Which microscope bombard a whole, metal-coated specimen with electrons moving back and forth over it
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Fluoresence
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Differential interference contrast
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Scanning electron
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Transmission electron
Correct Answer
A. Scanning electronExplanation
A scanning electron microscope (SEM) bombards a whole, metal-coated specimen with electrons moving back and forth over it. SEMs use a focused beam of electrons to scan the surface of a sample, creating detailed images of the specimen's surface morphology. The electrons interact with the atoms in the sample, producing signals that can be detected and used to create an image. This technique is particularly useful for studying the surface features of materials and provides high-resolution images with great depth of field.Rate this question:
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- 49.
Metabollic pathways that regenerate their starting point is called _____ pathways.
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Linear
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Bi-directional
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Convergent
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Cyclic
Correct Answer
A. CyclicExplanation
Cyclic pathways are metabolic pathways that regenerate their starting point. In these pathways, the initial substrate is converted into intermediate products, which are then further metabolized to regenerate the starting substrate. This creates a circular flow of metabolites within the pathway. Unlike linear pathways, where the end product is different from the starting substrate, cyclic pathways maintain the same starting point throughout the process. Bi-directional pathways allow for reversible reactions, but they do not necessarily regenerate the starting point. Convergent pathways involve multiple substrates converging into a common intermediate, but they do not necessarily regenerate the starting point.Rate this question:
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Mar 21, 2023Quiz Edited by
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Jun 07, 2016Quiz Created by
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