Micro Lecture 2 Methods Of Studying Microorganisms - Tiff
(141).webp "Micro Lecture 2 Methods Of Studying Microorganisms - Tiff - Quiz")
This is designed to give an understanding of a few basic concepts in this lecture.
Questions and Answers
- 1.
Which is not one of the 5 I's of culturing microbes?
- A.
Inoculation
- B.
Identification
- C.
Incineration
- D.
Inspection
- E.
Incubation
Correct Answer
C. IncinerationExplanation
The 5 I's of culturing microbes refer to the essential steps involved in culturing and studying microorganisms. These steps are inoculation, incubation, isolation, inspection, and identification. Incineration is not one of the 5 I's because it does not pertain to the culturing process. Incineration is a method of sterilization that involves burning or exposing the microorganisms to high temperatures to completely destroy them. It is not a step in the culturing process, but rather a method used to dispose of contaminated materials or to sterilize certain equipment.Rate this question:
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- 2.
Name one of the 3 general properties to classify media
Correct Answer
physical state, chemical composition, functional typeExplanation
The question asks for one of the three general properties to classify media. The correct answer is physical state, chemical composition, and functional type. These properties are commonly used to categorize different types of media. Physical state refers to whether the media is solid, liquid, or gas. Chemical composition refers to the elements and compounds present in the media. Functional type refers to the purpose or role of the media, such as whether it is a conductor, insulator, or solvent. These properties help in understanding and distinguishing different types of media.Rate this question:
- 3.
Which is not a physical state of media?
- A.
Solid
- B.
Gas
- C.
Liquid
- D.
Semisolid
Correct Answer
B. GasExplanation
The correct answer is gas. Gas is not a physical state of media because it refers to substances that are in a state where their molecules are widely spread apart and have high kinetic energy. In contrast, solid, liquid, and semisolid are physical states of media where the molecules are more closely packed together and have lower kinetic energy.Rate this question:
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- 4.
Nutrient broth is
- A.
Liquid medium containing beef extract and peptone
- B.
Solid medium containing beef extract, peptone, and agar
Correct Answer
A. Liquid medium containing beef extract and peptoneExplanation
Nutrient broth is a liquid medium used for culturing bacteria and other microorganisms. It is made by dissolving beef extract and peptone in water. Beef extract provides essential nutrients and vitamins, while peptone serves as a source of amino acids and nitrogen. This liquid medium provides a rich environment for the growth of microorganisms, allowing them to multiply and form colonies. It is commonly used for various laboratory techniques, such as growing bacteria for identification and studying their metabolic activities.Rate this question:
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- 5.
The most commonly used solidifying agent is
Correct Answer
agarExplanation
Agar is the most commonly used solidifying agent because it is a natural polysaccharide derived from marine algae. It has several properties that make it ideal for solidifying media in laboratory settings. Agar is heat stable, allowing it to be sterilized without breaking down. It also forms a gel at low concentrations, making it easy to work with and providing a solid surface for microbial growth. Additionally, agar is not easily metabolized by most microorganisms, making it a suitable medium for isolating and culturing bacteria and fungi.Rate this question:
- 6.
Which of the following describes the chemical content of media?
- A.
Defined
- B.
Undefined
- C.
Well blended
- D.
Contaminated
Correct Answer
A. DefinedExplanation
The correct answer is "defined." This term refers to the chemical content of media being precisely known and controlled. It means that the composition of the media, including the concentration of various chemicals, is accurately determined and specified. This is important in scientific experiments and research, as it allows for consistent and reproducible results.Rate this question:
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- 7.
The following are all classes of media except:
- A.
General purpose
- B.
Differential
- C.
Selective
- D.
Enriched
- E.
Superficial
Correct Answer
E. SuperficialExplanation
The correct answer is "superficial" because the question is asking for a class of media, and "superficial" does not fit into any of the other categories mentioned (general purpose, differential, selective, enriched). "Superficial" typically refers to something shallow or lacking depth, which does not align with the concept of media classification.Rate this question:
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- 8.
Differential media contains 1+ agents that inhibit the growth of some microbes and encourage growth of the desired microbes
- A.
T
- B.
F
Correct Answer
B. FExplanation
The statement is false. Differential media contains agents that differentiate between different types of microbes based on their ability to metabolize certain substances or produce specific enzymes. It does not necessarily inhibit the growth of any microbes, but rather helps in distinguishing between them.Rate this question:
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- 9.
What is inoculation?
- A.
Introduction of a tiny sample into a nutrient container which provides an environment that the sample does not multiply in
- B.
Sexual reproduction
- C.
Introduction of a tiny sample into a nutrient container which provides an environment that the sample can multiply in
Correct Answer
C. Introduction of a tiny sample into a nutrient container which provides an environment that the sample can multiply inExplanation
Inoculation refers to the introduction of a small sample into a nutrient container that offers an environment conducive for the sample to multiply. This process is commonly used in microbiology to cultivate and grow microorganisms for various purposes such as research, diagnostics, and production of vaccines or antibiotics. By providing the necessary nutrients and conditions, the sample can proliferate and form a visible colony or culture, allowing scientists to study and manipulate the microorganisms.Rate this question:
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- 10.
Which of the following is not a culture type that can arise during inspection?
- A.
Contaminated
- B.
Generic
- C.
Pure
- D.
Mixed
Correct Answer
B. GenericExplanation
The term "generic" refers to a type of culture that is not specific or specialized. In the context of inspection, generic cultures are not typically used or considered as a specific type that can arise. Instead, contaminated, pure, and mixed cultures are commonly encountered during inspections.Rate this question:
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- 11.
What is magnification?
Correct Answer
ability to enlarge objects, enlarging objects, enlargeExplanation
Magnification refers to the ability to enlarge objects or make them appear larger than their actual size. It is a measure of how much an object is visually amplified when viewed through a lens or optical instrument. By increasing the apparent size of an object, magnification allows for a closer and more detailed examination of its features. This can be achieved through various means such as using a microscope, telescope, or magnifying glass.Rate this question:
- 12.
Resolution is....
- A.
Ability to enlarge an object
- B.
Ability to show detail
- C.
Ability to solve a conflict
Correct Answer
B. Ability to show detailExplanation
The resolution refers to the ability to show detail. In the context of digital images or displays, resolution determines the level of clarity and sharpness in the visual representation. Higher resolution means more pixels are used to display the image, resulting in finer details being visible. This can be important in various applications such as photography, video, and graphics, where the ability to show intricate details is crucial for a better viewing experience.Rate this question:
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- 13.
The difference between bright field and dark field is
- A.
In the bright field the background is darker than the object and the dark field the object is darker than the background
- B.
In the bright field the object is darker than the background and the dark field the background is darker than the object
Correct Answer
B. In the bright field the object is darker than the background and the dark field the background is darker than the objectExplanation
In bright field microscopy, the object being observed appears darker than the background. This is because the light passes through the object and is absorbed or scattered, resulting in less light reaching the viewer's eye. In contrast, in dark field microscopy, the background appears darker than the object. This is achieved by using oblique lighting, where the light is directed at an angle onto the specimen. The light that is scattered or refracted by the object is then captured by the objective lens, while the direct light is blocked, creating a dark background.Rate this question:
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- 14.
Fluorescence is useful in diagnosing
Correct Answer
infectionsExplanation
Fluorescence is useful in diagnosing infections because it allows for the detection and visualization of specific markers or molecules associated with the infection. By using fluorescent dyes or probes, healthcare professionals can identify and locate the presence of infectious agents, such as bacteria or viruses, in patient samples. This method provides a quick and accurate diagnosis, enabling timely treatment and management of infections.Rate this question:
- 15.
Which electron microscope gives a 3D image?
- A.
Transmission
- B.
Scanning
Correct Answer
B. ScanningExplanation
The scanning electron microscope gives a 3D image. Unlike the transmission electron microscope, which creates a 2D image, the scanning electron microscope uses a focused beam of electrons to scan the surface of a sample. The electrons interact with the atoms on the surface, creating signals that are used to construct a 3D image of the sample. This allows for detailed examination of the surface topography and morphology of the sample, making the scanning electron microscope ideal for studying the surface features of objects.Rate this question:
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- 16.
Basic dyes dye negatively charged areas
- A.
T
- B.
F
Correct Answer
A. TExplanation
Basic dyes are a type of dye that are positively charged. When they come into contact with negatively charged areas, such as certain types of fabric or materials, they are able to bind and color those areas effectively. Therefore, it is true that basic dyes dye negatively charged areas.Rate this question:
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- 17.
Positive staining
- A.
Dye sticks to background
- B.
Dye sticks to microbe
Correct Answer
B. Dye sticks to microbeExplanation
In positive staining, the dye used in the staining process binds specifically to the microbe being studied, resulting in the microbe being colored or stained. This allows for easier visualization and identification of the microbe under a microscope. The fact that the dye sticks to the microbe and not the background indicates that the staining process is successful in highlighting the microbe of interest.Rate this question:
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- 18.
The difference between a simple stain and a structural stain is
- A.
A simple stain shows the organelles and the structural stain doesnt
- B.
A simple stain is simple to do and a structural stain requires agar
- C.
A structural stain shows organelles and simple stain shows shape and size
- D.
There is no difference between the 2
Correct Answer
C. A structural stain shows organelles and simple stain shows shape and sizeExplanation
A simple stain is a staining technique that uses a single dye to color the entire cell or organism, allowing for the visualization of its shape and size. On the other hand, a structural stain is a staining technique that uses specific dyes to highlight and visualize specific structures or organelles within the cell, providing more detailed information about its internal components. Therefore, the correct answer is that a structural stain shows organelles and a simple stain shows shape and size.Rate this question:
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Nov 24, 2023Quiz Edited by
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Jan 31, 2010Quiz Created by
Husop
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