Question 1

Which of the following statements best explains why prokaryotic genomes are generally smaller and less complex than eukaryotic genomes?

Accepted Answer

Prokaryotes have fewer non-coding regions and less repetitive DNA, resulting in smaller genomes.

Question 2

A researcher exposes bacterial cells to ultraviolet (UV) light, resulting in the formation of thymine dimers in the DNA. This is an example of which of the following?

Accepted Answer

An induced mutation caused by a mutagen

Question 3

Which of the following best describes the flow of genetic information in the central dogma of molecular biology?

Accepted Answer

DNA $$\rightarrow$$ RNA $$\rightarrow$$ Protein

Question 4

A patient is diagnosed with a persistent viral infection that eventually leads to cancer. Which of the following best explains how this can occur?

Accepted Answer

The virus integrates its genome into the host DNA, disrupting normal cell cycle regulation.

Question 5

Which of the following viruses has a double-stranded DNA genome?

Accepted Answer

Hepadnaviridae

Question 6

A scientist is using a catalase test to identify a bacterial specimen. Which of the following results would indicate a positive catalase test?

Accepted Answer

The formation of bubbles after adding hydrogen peroxide

Question 7

During glycolysis, glucose is converted into which of the following products?

Accepted Answer

Two molecules of pyruvate

Question 8

Which of the following best describes the function of enzyme cofactors?

Accepted Answer

They are non-protein molecules that assist enzymes in catalyzing reactions.

Question 9

A hospital is experiencing an outbreak of a prion disease. Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that cause misfolding of normal host proteins.

Question 10

Which of the following best explains why selective media are used in microbiology laboratories?

Accepted Answer

They contain substances that inhibit the growth of some microbes while allowing others to grow.

Question 11

A bacterium is able to acquire antibiotic resistance genes from its environment without cell division. Which process is responsible for this genetic change?

Accepted Answer

Transformation

Question 12

Which of the following equations correctly represents the net ATP yield from aerobic respiration of one molecule of glucose in prokaryotes?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 38ATP$$

Question 13

A microbiologist is culturing bacteria in a closed batch system. During which phase of growth are bacteria most susceptible to antibiotics that target cell wall synthesis?

Accepted Answer

Log (exponential) phase

Question 14

Which of the following best describes an amphibolic pathway?

Accepted Answer

A pathway that can function in both catabolism and anabolism

Question 15

Which of the following is a key difference between fermentation and aerobic respiration?

Accepted Answer

Fermentation does not require oxygen and produces less ATP than aerobic respiration.

Question 16

A patient sample is tested using the oxidase test. Which of the following results indicates a positive oxidase test?

Accepted Answer

A purple color develops after adding the oxidase reagent

Question 17

Which of the following best explains why viruses are considered nonliving pathogens?

Accepted Answer

They cannot reproduce independently and require a host cell for replication.

Question 18

Which of the following best describes the role of redox reactions in cellular respiration?

Accepted Answer

Redox reactions transfer electrons to fuel the recharging of ADP to ATP.

Question 19

A laboratory technician needs to count the number of bacteria in a water sample. Which of the following methods would provide a direct count of microbial cells?

Accepted Answer

Performing a viable plate count

Question 20

Which of the following best describes the function of viral envelopes?

Accepted Answer

They help the virus attach to and enter host cells.

Microbiology Study Guide: Genetics, Viruses, Microbial Growth, and Metabolism

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