Question 1

Which of the following is a major characteristic of the ideal antimicrobial drug, according to Table 12.1?

Accepted Answer

It should be selectively toxic to the microbe but nontoxic to host cells.

Question 2

Why are there more classes of antibacterial drugs than antifungal or antiviral drugs?

Accepted Answer

Bacterial cells have more unique targets that differ from human cells.

Question 3

Which historical event marked the discovery of the first synthetic antimicrobial?

Accepted Answer

Domagk’s discovery of Prontosil

Question 4

A patient is prescribed a drug that blocks the synthesis of peptidoglycan. Which type of microorganism is this drug most likely targeting?

Accepted Answer

Bacteria

Question 5

Which equation correctly represents the calculation of the therapeutic index (TI) for an antimicrobial drug?

Accepted Answer

$$TI = \frac{Toxic\ Dose}{MIC}$$

Question 6

Which mechanism is responsible for the development of acquired drug resistance in bacteria?

Accepted Answer

Both spontaneous mutations and acquisition of new genes

Question 7

A broad-spectrum antibiotic is most likely to cause which of the following complications?

Accepted Answer

Superinfection due to disruption of normal microbiota

Question 8

Which of the following drugs acts by inhibiting folic acid synthesis in bacteria?

Accepted Answer

Sulfonamides

Question 9

Why is selective toxicity difficult to achieve when designing antiviral drugs?

Accepted Answer

Viruses use host cell machinery for replication.

Question 10

Which of the following is a common reason for the rapid spread of antibiotic resistance in healthcare settings?

Accepted Answer

Insufficient infection prevention in hospitals

Question 11

A patient with a severe staphylococcal infection is allergic to penicillin and methicillin. Which drug is most appropriate for treatment?

Accepted Answer

Vancomycin

Question 12

Which of the following best describes the action of aminoglycosides?

Accepted Answer

Cause misreading of mRNA during protein synthesis

Question 13

Which laboratory test is used to determine the minimum inhibitory concentration (MIC) of an antimicrobial drug?

Accepted Answer

Serial Dilution Test

Question 14

Which of the following is a reason pharmaceutical companies are reluctant to develop new antibiotics?

Accepted Answer

Antibiotics require long and costly clinical trials with low confidence in success.

Question 15

Which of the following is a real-world implication of increasing antimicrobial resistance?

Accepted Answer

Common surgeries may become too risky due to infection.

Question 16

Which of the following drugs is used to treat infections with Mycobacterium tuberculosis by interfering with mycolic acid synthesis?

Accepted Answer

Isoniazid (INH)

Question 17

Which of the following is a mechanism by which bacteria can become resistant to antibiotics?

Accepted Answer

Production of enzymes that inactivate the drug

Question 18

Which of the following is a benefit of using synergistic drug combinations in antimicrobial therapy?

Accepted Answer

Enhanced effectiveness and reduced risk of resistance

Question 19

Which antifungal drug group acts by binding to fungal membranes and causing loss of selective permeability?

Accepted Answer

Polyenes (e.g., Amphotericin B)

Question 20

A patient is prescribed a drug with a short half-life. What is the most likely implication for the dosing schedule?

Accepted Answer

The drug requires frequent dosing to maintain therapeutic levels.

Antimicrobial Drugs and Microbial Resistance: Principles, History, and Clinical Relevance

Study Guide - Practice Questions