Question 1

Which of the following best describes the difference between fungal and human cell membranes?

Accepted Answer

Fungal cell membranes contain ergosterol, while human cell membranes contain cholesterol.

Question 2

A patient presents with a superficial fungal infection. Which of the following is most likely the site of infection?

Accepted Answer

Skin

Question 3

Which of the following statements about prions is correct?

Accepted Answer

Prions are infectious proteins that lack nucleic acids.

Question 4

Which of the following is a key difference between lytic and lysogenic viral cycles?

Accepted Answer

The lysogenic cycle involves integration of viral DNA into the host genome, while the lytic cycle results in immediate destruction of the host cell.

Question 5

Which of the following is a function of lysozyme in nonspecific immunity?

Accepted Answer

It breaks down peptidoglycan in bacterial cell walls.

Question 6

A patient is prescribed an antibiotic that inhibits cell wall synthesis. Which type of microorganism is this drug most likely targeting?

Accepted Answer

Bacteria

Question 7

Which of the following best explains why there are few anti-protozoal drugs compared to antibiotics?

Accepted Answer

Protozoa are eukaryotic and share many cellular features with human cells, making selective toxicity difficult.

Question 8

Which of the following is a major mechanism by which bacteria develop resistance to antibiotics?

Accepted Answer

Production of enzymes that inactivate the drug, such as beta-lactamase.

Question 9

Which of the following is true regarding selective toxicity of antimicrobial drugs?

Accepted Answer

Selective toxicity refers to the ability of a drug to target microbial cells without harming human cells.

Question 10

Which of the following is a role of complement activation in nonspecific immunity?

Accepted Answer

Opsonization, which enhances phagocytosis of pathogens.

Question 11

A virus with a single-stranded RNA genome that must be converted to DNA before replication is classified as which type?

Accepted Answer

Retrovirus

Question 12

Which of the following equations correctly represents the Michaelis-Menten equation for enzyme kinetics, relevant to antimicrobial drug action?

Accepted Answer

$$v = \frac{V_{max}[S]}{K_m + [S]}$$

Question 13

Which of the following is a distinguishing feature of protozoa compared to bacteria?

Accepted Answer

Protozoa are eukaryotic and possess membrane-bound organelles.

Question 14

Which of the following best describes the action of bacteriostatic drugs?

Accepted Answer

They inhibit bacterial growth without killing the bacteria.

Question 15

Which of the following is a correct statement about the role of TLR (Toll-like receptors) in immunity?

Accepted Answer

TLRs recognize pathogen-associated molecular patterns and activate immune responses.

Question 16

A patient is infected with a virus that uses host RNA polymerase for replication. Which type of viral genome does this virus most likely possess?

Accepted Answer

Double-stranded DNA

Question 17

Which of the following is a correct description of the process of phagocytosis?

Accepted Answer

Engulfment and digestion of foreign particles by immune cells.

Question 18

Which of the following is a major difference between acute and chronic viral infections?

Accepted Answer

Acute infections are characterized by rapid onset and resolution, while chronic infections persist over a long period.

Question 19

Which of the following is a correct formula for calculating the therapeutic index of a drug?

Accepted Answer

$$	ext{Therapeutic Index} = \frac{	ext{Toxic Dose}}{	ext{Effective Dose}}$$

Microbiology Study Guide: Fungi, Protists, Viruses, Immunity, and Antimicrobial Medicine

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