Question 1

Which of the following best explains why viruses are not considered living organisms?

Accepted Answer

Because they lack ribosomes and cannot synthesize proteins independently.

Question 2

A patient is diagnosed with botulism after eating improperly canned food. The causative agent, Clostridium botulinum, produces its toxin due to which of the following?

Accepted Answer

It contains a prophage that encodes the toxin gene.

Question 3

Which of the following is the most effective method to prevent a viral infection such as influenza?

Accepted Answer

Receiving a vaccine if one is available.

Question 4

A scientist observes a microorganism that grows optimally at 37$$^\circC. $$This organism is best classified as a:

Accepted Answer

Mesophile

Question 5

Which of the following statements about enzyme activity and temperature is correct?

Accepted Answer

Enzyme activity slows down at temperatures below and above the optimal temperature.

Question 6

A bacterial culture is transferred from an alkaline environment (pH 10.0) to a neutral pH medium. What is the most likely outcome?

Accepted Answer

The bacteria will die due to the drastic pH change.

Question 7

Which method would count both live and dead bacterial cells in a sample?

Accepted Answer

Direct Microscopic Count.

Question 8

Which of the following best describes the fate of pyruvic acid in an organism that uses anaerobic respiration?

Accepted Answer

Most of its carbons are oxidized in the Kreb’s Cycle.

Question 9

Which of the following statements about ATP is correct?

Accepted Answer

The energy required to make ATP is reasonable for the cell.

Question 10

Which of the following is a coenzyme involved in biological oxidation-reduction reactions?

Accepted Answer

NAD+

Question 11

During which phase of bacterial growth are cells dividing at their maximum rate?

Accepted Answer

Log phase

Question 12

Which of the following best describes the process of substrate-level phosphorylation?

Accepted Answer

A phosphate group is transferred directly from an organic molecule to ADP.

Question 13

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation uses an organic final electron acceptor.

Question 14

The poison cyanide is lethal because it directly interferes with which cellular process?

Accepted Answer

The Electron Transport Chain

Question 15

Which of the following best describes the role of ATP synthase in cellular metabolism?

Accepted Answer

It synthesizes ATP during oxidative phosphorylation.

Question 16

Which of the following statements about the core metabolic pathways is correct?

Accepted Answer

They include glycolysis and the Kreb’s Cycle.

Question 17

In biological oxidations, what is typically removed from a molecule?

Accepted Answer

Hydrogen atoms

Question 18

Which of the following contains the most energy and is used to drive ATP synthesis in the electron transport chain?

Accepted Answer

NADH

Question 19

Fatty acids, which are breakdown products from fats, enter metabolism at which point?

Accepted Answer

In one of the core pathways such as the Kreb’s Cycle

Question 20

A patient is infected with Streptococcus, which only carries out fermentation. What is the most likely reason for this metabolic limitation?

Accepted Answer

It is missing an enzyme in the Kreb’s Cycle.

Microbiology Exam 2 Study Guide – Step-by-Step Guidance

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