Preparing For The Microbiology Exam? The Quiz Questions Can Help!
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Think you know all there is to know about the microscopic organisms? Take our quiz, if you are preparing for your microbiology final exam, in which you will be tested on all of the knowledge you’ve recently acquired through your studies of microscopic organisms. All the best!
Questions and Answers
- 1.
Bacterial growth phase where cellular division seems to have stopped or ceases for a period of time:
- A.
The Lag Phase
- B.
The Log Phase
- C.
The Stationary Phase
- D.
The Death Phase
Correct Answer
C. The Stationary PhaseExplanation
The stationary phase is a bacterial growth phase where cellular division seems to have stopped or ceases for a period of time. During this phase, the growth rate of the bacteria slows down, and the number of new cells being produced is balanced by the number of cells dying. The stationary phase occurs when the bacteria have depleted the available nutrients in their environment, and they enter a state of metabolic dormancy. This phase is characterized by a stable population size and a decrease in overall metabolic activity.Rate this question:
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- 2.
Used on fastidious organisms that require defined known quantities of specific nutrients:
- A.
Nutrient broth
- B.
Nutrient agar
- C.
Defined media
- D.
Complex media
Correct Answer
C. Defined mediaExplanation
Defined media are used for fastidious organisms that require defined known quantities of specific nutrients. These organisms have very specific nutritional requirements and cannot grow on media that contain complex mixtures of nutrients. Defined media provide a controlled environment where the exact composition of the nutrients is known, allowing researchers to provide the precise nutrients needed for the growth of these organisms. This ensures that the organisms receive the specific nutrients they require and allows for accurate and reproducible growth conditions. Nutrient broth and nutrient agar, on the other hand, contain complex mixtures of nutrients and are used for organisms with less specific nutritional requirements. Complex media are also used for organisms with complex nutritional needs.Rate this question:
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- 3.
Protection against osmotic lyses is provided by:
- A.
The cellular plasma membrane
- B.
The cell wall
- C.
The cell's capsule
- D.
Lysosomes
Correct Answer
B. The cell wallExplanation
The cell wall provides protection against osmotic lysis. Osmotic lysis occurs when there is a difference in solute concentration between the inside and outside of a cell, causing water to rush into the cell and potentially burst it. The cell wall is a rigid structure that surrounds the cell membrane in many organisms, providing support and preventing the cell from bursting under osmotic pressure. Therefore, the cell wall acts as a protective barrier against osmotic lysis.Rate this question:
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- 4.
Thermophiles develop at temperatures between:
- A.
-5 and 20C
- B.
40 and 80C
- C.
-5 and 35C
- D.
65 and 105C
Correct Answer
B. 40 and 80CExplanation
Thermophiles are organisms that thrive in high-temperature environments. The given answer of 40 and 80C indicates the temperature range at which thermophiles can develop. This range is suitable for their survival and growth, as they have adapted to extreme heat conditions. Temperatures below 40C may be too low for their metabolism, while temperatures above 80C may be too high and denature their proteins. Therefore, the correct answer represents the optimal temperature range for thermophiles to thrive.Rate this question:
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- 5.
Name associate to the presence of a cell wall and a capsule together in a bacterial cell:
- A.
The cytoplasmic membrane
- B.
The Envelop
- C.
The Capsule
- D.
The Cell Wall
Correct Answer
B. The EnvelopExplanation
The presence of a cell wall and a capsule together in a bacterial cell is associated with the Envelop. The Envelop is a structure that surrounds the cytoplasmic membrane of the bacterial cell and consists of the cell wall and the capsule. The cell wall provides structural support and protection to the cell, while the capsule is a slimy layer outside the cell wall that helps the bacteria evade the immune system and adhere to surfaces. Therefore, the Envelop is the correct term to describe the combination of the cell wall and the capsule in a bacterial cell.Rate this question:
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- 6.
Which group do strict anaerobes partner with to find an environmental condition optimal for growth?
- A.
Obligated aerobes
- B.
Aerotolerant anaerobes
- C.
Microaerophiles
- D.
Facultative anaerobes
Correct Answer
D. Facultative anaerobesExplanation
Facultative anaerobes are able to survive and grow in both aerobic and anaerobic environments. They can switch between aerobic respiration and fermentation depending on the availability of oxygen. When oxygen is present, they can use aerobic respiration to generate energy. However, in the absence of oxygen, they can switch to fermentation to continue producing energy. Therefore, strict anaerobes can partner with facultative anaerobes to find an environmental condition optimal for growth, as facultative anaerobes can create anaerobic conditions when necessary.Rate this question:
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- 7.
What statement is not descriptive of the Log Exponential Phase
- A.
Population growth is uniform
- B.
Growth rate is constant
- C.
Cells exhibit balanced growth
- D.
It varies in length
Correct Answer
D. It varies in lengthExplanation
The Log Exponential Phase is a stage in the growth of a population where the growth rate is constant and cells exhibit balanced growth. During this phase, the population size increases exponentially. However, the length of the Log Exponential Phase can vary depending on various factors such as the availability of nutrients and environmental conditions. Therefore, the statement "It varies in length" is not descriptive of the Log Exponential Phase.Rate this question:
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- 8.
What is Microbiology?
- A.
The study of organisms too small to be seen with the naked eye.
- B.
Organism or agents too small to be visible with the naked eye.
- C.
Microorganisms relatively simple in their construction.
- D.
Microorganism that become nutrients to other organisms.
Correct Answer
A. The study of organisms too small to be seen with the naked eye.Explanation
Microbiology is the study of organisms that are too small to be seen with the naked eye. This field focuses on the study of microorganisms such as bacteria, viruses, fungi, and protozoa. These organisms are microscopic in size and play a significant role in various aspects of life, including human health, agriculture, ecology, and industry. By studying microbiology, scientists can gain a better understanding of these tiny organisms and their impact on the world around us.Rate this question:
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- 9.
Organelle responsible for the transport/delivery of ER products across different parts of the cell.
- A.
The Golgi complex
- B.
The Smooth ER
- C.
The Rough ER
- D.
The Nucleus
Correct Answer
A. The Golgi complexExplanation
The Golgi complex is responsible for the transport and delivery of ER products across different parts of the cell. It receives proteins and lipids from the endoplasmic reticulum (ER) and modifies, sorts, and packages them into vesicles for transport to their final destinations within the cell or for secretion outside of the cell. This organelle plays a crucial role in intracellular trafficking and is involved in the processing and modification of proteins and lipids before they are sent to their appropriate locations.Rate this question:
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- 10.
Bacterial growth phase where a maximal rate of cellular division is obtained:
- A.
The Lag phase
- B.
The Log phase
- C.
The Stationary phase
- D.
The Death phase
Correct Answer
B. The Log phaseExplanation
The Log phase is the correct answer because during this phase, bacteria experience exponential growth and divide at their maximum rate. The population of bacteria increases rapidly as each bacterium divides into two, then those two divide into four, and so on. This phase is characterized by a constant rate of growth and a balanced ratio of cell division to cell death. Once the nutrients become limited or waste products accumulate, the bacteria enter the stationary phase.Rate this question:
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- 11.
Contributes to the negative charge of Gram - bacteria:
- A.
Broun's lipoproteins
- B.
Porins
- C.
Teichoic acids
- D.
LPS
Correct Answer
D. LPSExplanation
LPS (lipopolysaccharides) contribute to the negative charge of Gram - bacteria. LPS is a major component of the outer membrane of Gram - bacteria and consists of lipid A, core oligosaccharide, and O antigen. The lipid A portion of LPS is responsible for the negative charge as it contains phosphate groups. This negative charge helps Gram - bacteria to repel positively charged molecules and contributes to their survival and defense against host immune responses.Rate this question:
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- 12.
A Pure Culture:
- A.
Presents a mixture of microbial organisms
- B.
Can only be obtained by isolating the progeny of single cell
- C.
Was first created by the efforts of microbiologist Luis Pasteur
- D.
Can be obtained by growing bacteria in differential media
Correct Answer
B. Can only be obtained by isolating the progeny of single cellExplanation
A pure culture can only be obtained by isolating the progeny of a single cell because it ensures that all the organisms in the culture are genetically identical. By starting with a single cell and allowing it to grow and divide, any contaminants or other organisms present in the original sample are eliminated, resulting in a culture that contains only the desired organism. This is important in microbiology research and applications where studying or manipulating a specific organism's characteristics or behavior is necessary.Rate this question:
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- 13.
What statement describes bacteria that stains "pink" after a Gram stain:
- A.
Bacteria that have lost all crystal violet staining after gram's alcohol washing
- B.
Bacteria that have retained crystal violet during staining
- C.
Bacteria that maintain their peptidoglycan layer
- D.
Bacteria that failed to counterstain with safranin
Correct Answer
A. Bacteria that have lost all crystal violet staining after gram's alcohol washingExplanation
The correct answer is "Bacteria that have lost all crystal violet staining after gram's alcohol washing". This statement accurately describes bacteria that stain "pink" after a Gram stain. During a Gram stain, bacteria are first stained with crystal violet, then treated with iodine to form a crystal violet-iodine complex. The bacteria are then washed with alcohol, which acts as a decolorizing agent. If the bacteria lose the crystal violet stain during this step, they will not retain any color and will appear pink after counterstaining with safranin. This indicates that the bacteria have a thin peptidoglycan layer and are classified as Gram-negative.Rate this question:
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- 14.
Organism that can only thrive at very specific concentrations of oxygen within a medium (2-10% oxygen):
- A.
Obligate aerobes
- B.
Facultative anaerobes
- C.
Aerotolerant anaerobes
- D.
Microaerophiles
Correct Answer
D. MicroaerophilesExplanation
Microaerophiles are organisms that can only thrive at very specific concentrations of oxygen within a medium, typically between 2-10% oxygen. Unlike obligate aerobes, which require high levels of oxygen, microaerophiles can only tolerate low levels of oxygen. They are also different from facultative anaerobes, which can survive in both aerobic and anaerobic conditions, and aerotolerant anaerobes, which can survive in the presence of oxygen but do not use it for their metabolic processes. Microaerophiles have adapted to live in environments with limited oxygen availability and have specific mechanisms to deal with the toxic effects of oxygen.Rate this question:
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- 15.
Gram positive bacteria stain:
- A.
Purple
- B.
Orange
- C.
Black
- D.
Pink
Correct Answer
A. PurpleExplanation
Gram positive bacteria stain purple because they have a thick peptidoglycan layer in their cell wall, which retains the crystal violet dye during the Gram staining procedure. This dye is then trapped by the iodine solution, forming a complex that cannot be washed out. As a result, when the bacteria are treated with a decolorizing agent and counterstained with safranin, the purple color remains, indicating that the bacteria are Gram positive.Rate this question:
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- 16.
Bacterial type that presents teichoic acids associated to it's peptidoglycan cell wall:
- A.
Gram +
- B.
Gram -
- C.
Archaea
- D.
Acids Fast
Correct Answer
A. Gram +Explanation
Gram-positive bacteria have teichoic acids associated with their peptidoglycan cell wall. Teichoic acids are polymers composed of glycerol or ribitol phosphate that are covalently linked to the peptidoglycan layer. These acids play a role in cell wall structure and stability, as well as in the regulation of cell division and the binding of certain molecules. Gram-negative bacteria, archaea, and acid-fast bacteria do not have teichoic acids associated with their cell walls.Rate this question:
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- 17.
Which dye will be more likely to adhere to the surface of a gram positive bacteria?
- A.
Anionic
- B.
Cationic
- C.
Neutral
- D.
Differential
Correct Answer
B. CationicExplanation
Cationic dyes have a positive charge, which allows them to interact with the negatively charged cell wall of gram-positive bacteria. This attraction between opposite charges promotes the adherence of cationic dyes to the bacterial surface, making them more likely to be retained by gram-positive bacteria. Anionic dyes, on the other hand, have a negative charge and would repel the negatively charged cell wall, making them less likely to adhere. Neutral dyes do not have a charge and would also have a lower likelihood of adhering to the bacterial surface. The term "differential" does not provide any information about the charge of the dye and is therefore not relevant to the question.Rate this question:
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- 18.
Present outside the plasma membrane f organisms of domain Archaea:
- A.
Slime Layer
- B.
Endospores
- C.
Glycocalyx
- D.
S-layer
Correct Answer
D. S-layerExplanation
The S-layer is a protective layer found outside the plasma membrane of organisms in domain Archaea. It is composed of proteins or glycoproteins and provides structural support and protection against environmental stresses. The S-layer also plays a role in cell adhesion and communication. It is not found in all Archaea species, but when present, it is an important component of their cell structure.Rate this question:
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- 19.
What component of the LPS structure acts as an exotoxin:
- A.
The O antigen
- B.
The Lipid A region
- C.
The core polysaccharide
- D.
The thecoid acid
Correct Answer
B. The Lipid A regionExplanation
The Lipid A region of the LPS structure acts as an exotoxin. Lipid A is the toxic component of LPS and is responsible for the endotoxic effects observed during bacterial infections. It can activate the immune system and trigger inflammatory responses in the host. This region anchors the LPS molecule to the outer membrane of Gram-negative bacteria and is essential for its pathogenicity.Rate this question:
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- 20.
Which of the following is true about the lag phase:
- A.
Cells adapt to a new medium
- B.
In some cases it may be very short
- C.
Cells replenish spent materials
- D.
All of the above
Correct Answer
D. All of the aboveExplanation
The lag phase is a period of time in the growth curve of bacterial cells where there is little to no cell division occurring. During this phase, cells are adjusting and adapting to a new environment or medium, which is why the statement "Cells adapt to a new medium" is true. Additionally, the duration of the lag phase can vary depending on the specific conditions, so it is possible for it to be very short in some cases, supporting the statement "In some cases it may be very short." Lastly, during the lag phase, cells are also replenishing any materials that were depleted during the previous growth phase, justifying the statement "Cells replenish spent materials." Therefore, all of the statements are true about the lag phase.Rate this question:
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- 21.
The largest most diverse group of photosynthetic bacteria:
- A.
Yeast
- B.
Lichens
- C.
Cyanobacteria
- D.
Archaea
Correct Answer
C. CyanobacteriaExplanation
Cyanobacteria are the largest and most diverse group of photosynthetic bacteria. They are capable of performing photosynthesis, converting sunlight into energy and releasing oxygen as a byproduct. Cyanobacteria can be found in a wide range of environments, including freshwater, marine, and terrestrial habitats. They are known for their ability to form colonies and create structures called stromatolites, which are some of the oldest known fossils on Earth. Cyanobacteria play a crucial role in the Earth's ecosystems by producing oxygen and being a primary food source for many organisms.Rate this question:
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- 22.
The first stage of prokaryotic cell division entails:
- A.
Cytokinesis
- B.
Growth of a septum that separates the mother cell into two separate chambers
- C.
Growth of the cell dividing it's chromosome and enlarging it's cell volume
- D.
None of the above
Correct Answer
C. Growth of the cell dividing it's chromosome and enlarging it's cell volumeExplanation
In the first stage of prokaryotic cell division, the cell grows and divides its chromosome, while also enlarging its cell volume. This process is known as binary fission, where the cell replicates its genetic material and then divides into two identical daughter cells. Cytokinesis, which is the physical separation of the two daughter cells, occurs in the later stages of cell division. The growth of a septum that separates the mother cell into two chambers is not a characteristic of prokaryotic cell division.Rate this question:
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- 23.
Process of movement of bacteria towards or away from a particular stimulus or toxic agent:
- A.
Chemotaxis
- B.
Pseudopodia
- C.
Cilia
- D.
None of the above
Correct Answer
A. ChemotaxisExplanation
Chemotaxis is the correct answer because it refers to the process by which bacteria move towards or away from a specific stimulus or toxic agent. This movement is guided by chemical signals in the environment, which the bacteria detect and respond to. Chemotaxis allows bacteria to navigate towards beneficial substances, such as nutrients, or away from harmful substances, such as toxins. This process is essential for the survival and adaptation of bacteria in their environment.Rate this question:
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- 24.
Lacks a peptidoglycan cell wall and lives in extreme environments such as the hot springs of the Yellowstone Park:
- A.
Bacteria
- B.
Yeast
- C.
Prokaryotes
- D.
Archaea
Correct Answer
D. ArchaeaExplanation
Archaea lack a peptidoglycan cell wall and are known to thrive in extreme environments such as the hot springs of the Yellowstone Park. This distinguishes them from bacteria, yeast, and prokaryotes, which may have different cell wall compositions or are not specifically adapted to extreme environments.Rate this question:
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- 25.
Organism too small to be seen with the naked eye:
- A.
Microbiology
- B.
Microorganisms
- C.
Insects
- D.
Monkey's
Correct Answer
B. MicroorganismsExplanation
Microorganisms are too small to be seen with the naked eye. They include bacteria, viruses, fungi, and protozoa. These microscopic organisms play a crucial role in various ecological processes and can have both positive and negative effects on human health. They are studied in the field of microbiology, which focuses on understanding their structure, function, and interactions with their environment. Insects and monkeys, on the other hand, are visible to the naked eye and are not considered microorganisms.Rate this question:
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- 26.
A student is asked by the professor to sub-culture a bacterial organism onto fresh media for future studies. However during sub-culturing the students locks the test tube preventing oxygen flow into the media. After days the culture dyes. What type of culture did the student have at land:
- A.
Facultative anaerobe
- B.
Strict anaerobe
- C.
Obligate aerobe
- D.
None of the above
Correct Answer
C. Obligate aerobeExplanation
The student had an obligate aerobe culture because the test tube was locked, preventing oxygen flow into the media. Obligate aerobes require oxygen for their growth and survival. Without oxygen, they cannot carry out their metabolic processes and eventually die. Facultative anaerobes can survive with or without oxygen, strict anaerobes cannot survive in the presence of oxygen, and none of the above is not applicable in this scenario.Rate this question:
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- 27.
Term that describes when light neither passes through or bounces off an object or is transmitted through them:
- A.
Transmission
- B.
Absorption
- C.
Diffraction
- D.
Refraction
Correct Answer
B. AbsorptionExplanation
Absorption is the term that describes when light neither passes through nor bounces off an object or is transmitted through it. When light is absorbed, it is absorbed by the material and converted into other forms of energy, such as heat. This means that the light does not continue to travel through the object or reflect off of it. Therefore, absorption is the correct answer to the question.Rate this question:
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- 28.
Temperature below that of optimal growth cause bacterial cultures to:
- A.
Perish quickly at high temperatures
- B.
Slow their growth rate as temperatures approach the minimum
- C.
Thrive without any evident damage to the cell
- D.
None of the above
Correct Answer
B. Slow their growth rate as temperatures approach the minimumExplanation
Bacterial cultures slow their growth rate as temperatures approach the minimum because low temperatures can hinder their metabolic activities. As the temperature decreases, the enzymes responsible for various cellular processes become less efficient, resulting in a slower growth rate. This allows the bacteria to conserve energy and resources until conditions become more favorable for growth.Rate this question:
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- 29.
Bacterial families whose optimal growth occurs between pH 5.5 and pH 7:
- A.
Alkalophiles
- B.
Neutrophiles
- C.
Acidophiles
Correct Answer
B. NeutrophilesExplanation
Neutrophiles are bacterial families that thrive in environments with a neutral pH, ranging from pH 5.5 to pH 7. This means that they can grow and reproduce most effectively in conditions that are neither too acidic nor too alkaline. They are able to maintain a stable internal pH within this range, allowing them to carry out their metabolic processes efficiently. Unlike alkalophiles, which prefer alkaline conditions, and acidophiles, which prefer acidic conditions, neutrophiles have adapted to live in a more neutral pH range.Rate this question:
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- 30.
Observed during the death phase, it presents successive waves of genetically distinct variants:
- A.
The Log phase
- B.
The Lag phase
- C.
Prolonged decline growth
- D.
The stationary phase
Correct Answer
C. Prolonged decline growthExplanation
During the death phase, the population of cells starts to decline. Prolonged decline growth refers to a stage in the death phase where the population continues to decrease but at a slower rate. This phase is characterized by the presence of successive waves of genetically distinct variants, indicating that the cells are adapting and evolving in response to the unfavorable conditions. This prolonged decline growth allows the population to persist for a longer period before eventually reaching complete extinction.Rate this question:
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- 31.
Staining procedure designed for bacterial families with high lipid content and resistant to standard staining:
- A.
Gram stain
- B.
Negative staining
- C.
Simple stain
- D.
Acid fast staining
Correct Answer
D. Acid fast stainingExplanation
Acid fast staining is the correct answer because it is a staining procedure specifically designed for bacterial families that have high lipid content and are resistant to standard staining methods. This technique involves using a combination of heat, a primary stain (such as carbol fuchsin), and an acid-alcohol decolorizer to differentiate acid-fast bacteria (such as Mycobacterium tuberculosis) from non-acid-fast bacteria. Acid-fast staining is particularly useful in identifying bacteria that cause diseases like tuberculosis, as these bacteria have a waxy lipid layer that makes them difficult to stain using traditional methods like the Gram stain.Rate this question:
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- 32.
Which of the following is not considered a starvation response?
- A.
Cell death at a logarithmic rate
- B.
A decrease in cellular size and nucleoid condensation
- C.
Synthesis of starvation proteins
- D.
Endospore formation
Correct Answer
A. Cell death at a logarithmic rateExplanation
Cell death at a logarithmic rate is not considered a starvation response because during starvation, cells typically enter a state of dormancy or quiescence to conserve energy and resources. They may decrease in size and condense their nucleoid, synthesize specific proteins to adapt to the limited nutrient availability, and form endospores for survival. However, cell death at a logarithmic rate suggests uncontrolled cell growth rather than a response to starvation.Rate this question:
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- 33.
Organelle responsible for the synthesis of protein in a eukaryotic cell:
- A.
The Golgi complex
- B.
The Smooth ER
- C.
The rough ER
- D.
The nucleus
Correct Answer
C. The rough ERExplanation
The rough endoplasmic reticulum (ER) is responsible for the synthesis of proteins in a eukaryotic cell. It contains ribosomes on its surface, which are responsible for protein synthesis. These ribosomes translate the genetic information from the nucleus into proteins, which are then modified and processed within the rough ER before being transported to their final destinations. The rough ER plays a crucial role in protein synthesis and secretion in eukaryotic cells.Rate this question:
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- 34.
Bacterial families whose optimal growth occurs between pH 0 and 5.5:
- A.
Alkalophiles
- B.
Neutrophiles
- C.
Acidophiles
Correct Answer
C. AcidophilesExplanation
The correct answer is Acidophiles. Acidophiles are bacterial families that thrive in environments with low pH levels, specifically between pH 0 and 5.5. These bacteria have adapted to survive and grow in highly acidic conditions, which would be detrimental or even lethal to other types of bacteria. Acidophiles have unique mechanisms that allow them to maintain their internal pH balance and carry out essential cellular processes in such extreme environments.Rate this question:
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- 35.
What statement is NOT a reason for entering the stationary phase:
- A.
Nutrient limitation
- B.
Limited oxygen availability
- C.
Unlimited sources of nutrients
- D.
Reaching a critical population density
Correct Answer
C. Unlimited sources of nutrientsExplanation
Unlimited sources of nutrients is not a reason for entering the stationary phase because the stationary phase occurs when the growth rate of a population slows down or stops due to limited resources. If there are unlimited sources of nutrients available, the population would continue to grow and not enter the stationary phase.Rate this question:
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- 36.
Recognize which of the following statements is FALSE:
- A.
Microscopes use long wavelengths to resolve images better
- B.
The smaller the wavelength used the better the resolution
- C.
Resolution is the ability to see two objects as separate discrete units
- D.
If resolution is poor magnification is useless
Correct Answer
A. Microscopes use long wavelengths to resolve images betterExplanation
The given statement is false because microscopes actually use short wavelengths, not long wavelengths, to resolve images better. Shorter wavelengths allow for greater resolution, meaning that smaller details can be distinguished and observed more clearly.Rate this question:
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- 37.
Internal structure of a prokaryotic cell that form small bodies with accumulation of cellular material:
- A.
Endospores
- B.
The Nuclear region
- C.
The Lysosomes
- D.
Inclusion bodies
Correct Answer
D. Inclusion bodiesExplanation
Inclusion bodies are small bodies within a prokaryotic cell that accumulate cellular material. These bodies can consist of various substances such as proteins, lipids, or other molecules. They are often formed in response to stress or as a means of storing excess nutrients. Inclusion bodies play a role in cell metabolism and can be important for the survival and adaptation of prokaryotic cells.Rate this question:
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