Question 1

Which of the following best describes the function of the glycocalyx in bacterial cells?

Accepted Answer

It helps bacteria adhere to surfaces and protects against desiccation and phagocytosis.

Question 2

A patient is diagnosed with a Gram-negative bacterial infection. Which structural feature distinguishes Gram-negative from Gram-positive bacteria?

Accepted Answer

A thin peptidoglycan layer and an outer membrane containing lipopolysaccharide (LPS).

Question 3

During DNA replication, which enzyme is responsible for synthesizing the new DNA strand by adding nucleotides in the 5' to 3' direction?

Accepted Answer

DNA polymerase

Question 4

Which of the following best represents the central dogma of molecular biology?

Accepted Answer

$$DNA \rightarrow RNA \rightarrow Protein$$

Question 5

A point mutation in a gene results in a codon change from UAU to UAA. What is the most likely effect of this mutation?

Accepted Answer

A nonsense mutation resulting in premature termination of translation.

Question 6

Which of the following is an example of generalized transduction?

Accepted Answer

A bacteriophage accidentally packages random fragments of host DNA and transfers them to another bacterium.

Question 7

Which of the following antimicrobial agents acts by inhibiting cell wall synthesis?

Accepted Answer

Penicillin

Question 8

Which of the following is a characteristic of prion diseases?

Accepted Answer

They involve misfolded proteins that induce normal proteins to misfold.

Question 9

Which of the following best describes an opportunistic pathogen?

Accepted Answer

A microorganism that causes disease only when the host's defenses are compromised.

Question 10

A patient develops a fever, malaise, and a widespread rash after being exposed to a new pathogen. Which stage of infectious disease is the patient most likely experiencing?

Accepted Answer

Illness period

Question 11

Which of the following is NOT a function of the complement system?

Accepted Answer

Production of antibodies

Question 12

Which of the following statements about Major Histocompatibility Complex (MHC) molecules is correct?

Accepted Answer

MHC I molecules present endogenous antigens to CD8+ T cells.

Question 13

A child receives a vaccine containing inactivated virus particles. Which type of immunity is being induced?

Accepted Answer

Active artificial immunity

Question 14

Which of the following is a key virulence factor of Staphylococcus aureus that allows it to evade phagocytosis?

Accepted Answer

Capsule formation

Question 15

A patient presents with a black eschar on the skin after contact with livestock. Which microorganism is most likely responsible?

Accepted Answer

Bacillus anthracis

Question 16

Which of the following best explains antigenic shift in the Influenzavirus?

Accepted Answer

Exchange of gene segments between different influenza virus strains, resulting in a new subtype.

Question 17

A patient with AIDS is at increased risk for which of the following opportunistic infections?

Accepted Answer

Pneumocystis jirovecii pneumonia

Question 18

Which of the following statements about the replication cycle of HIV is correct?

Accepted Answer

HIV uses reverse transcriptase to synthesize DNA from its RNA genome.

Question 19

Which of the following best describes the structure of the Hepatitis B virus?

Accepted Answer

Enveloped, partially double-stranded DNA virus

Question 20

A hospital experiences an increase in infections among patients that were not present at admission. Which of the following best describes these infections?

Accepted Answer

Nosocomial infections

Comprehensive Microbiology Study Guide: Key Concepts and Review Topics

Study Guide - Practice Questions

Study Guide - Flashcards