Microbiology 2116 - Exam Questions and Correct Answers

Microbiology 2116 - Exam Questions and
Correct Answers
Question 1
Which of the following molecules is used to present antigen to cells of the adaptive
immune system?
TLR
MHC
Interferon
None of the above
Correct Answer
MHC



Question 2
During the "stationary phase" of microbial growth:
a) the rate of new cell division is greater than the cell death rate.
b) cells have stopped dividing entirely.
c) the rate of new cell division is approximately equal to the cell death rate.
d) the rate of new cell division is less than the cell death rate.
Correct Answer
c) the rate of new cell division is approximately equal to the cell death rate.



Question 3
When food production relies on microbial fermentation, the microorganisms involved
must be:
a) supplied with abundant oxygen.
b) maintained at low oxygen concentration.
c) able to oxidize pyruvate.
d) able to synthesize ATP via electron transport.
Correct Answer
b) maintained at low oxygen concentration.




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,Question 4
Which of the following statements is true?
a) Tetanus toxin causes flaccid paralysis
b) Botulism toxin causes muscles to tighten and give a characteristic lock jaw
appearance
c) Diptheria is caused by an endotoxin
d) Endotoxins are only produced by gram-negative bacteria
Correct Answer
d) Endotoxins are only produced by gram-negative bacteria



Question 5
The oxidation of biological molecules in cell respiration is completed in:
a) glycolysis.
b) the Krebs cycle.
c) electron transport.
d) fermentation.
Correct Answer
b) the Krebs cycle.



Question 6
Which of the following is NOT considered part of an inflammatory response?
a) Increased vasodilation.
b) Increased permeability of blood vessels.
c) Movement of leukocytes out of the blood to the site of infection.
d) Activation of T cells in lymph nodes.
Correct Answer
d) Activation of T cells in lymph nodes.




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,Question 7
Most enzymes are composed of _______.
A. protein
B. carbohydrate
C. lipid
D. DNA
Correct Answer
A. protein



Question 8
Which of the following describes a process that is part of innate immunity?
a) Upon infection by pathogens, phagocytic cells start to engulf and destroy the
pathogens.
b) Certain immune responses are targeted at specific microorganisms.
c) Antibodies can bind the surface of pathogens, aiding in their destruction.
d) Generally, the second exposure to a particular pathogen results in a stronger and
faster immune response.
Correct Answer
a) Upon infection by pathogens, phagocytic cells start to engulf and destroy the
pathogens.



Question 9
Cofactors can be
A. holoenzymes
B. metallic
C. apoenzymes
D. substrates
Correct Answer
B. metallic




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, Question 10
Identify the form of potential energy below:
A. thermal energy
B. radiant energy
C. mechanical energy
D. chemical energy
Correct Answer
D. chemical energy



Question 11
Which category of emergent disease best fits West Nile virus in North America?
a) Invasion of a new host population by a known pathogen.
b) A completely new, previously unknown disease.
c) The association of a well-known disease with a new pathogen.
d) Increased virulence of a known, but previously less virulent pathogen.
Correct Answer
a) Invasion of a new host population by a known pathogen.



Question 12
Enzymes ____________ the activation energy required for a chemical reaction to
proceed, acting as organic catalysts.
A. raise
B. lower
Correct Answer
B. lower



Question 13
If barriers to entry successfully block infection:
a) only an innate response will be activated.
b) only an adaptive response will be activated.
c) both an innate and an adaptive response will be activated.
d) neither an innate nor an adaptive response will be activated.
Correct Answer
d) neither an innate nor an adaptive response will be activated.




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