Question 1

Which of the following best describes 'selective toxicity' in the context of antimicrobial drugs?

Accepted Answer

The drug only targets microbial cells, leaving host cells unharmed.

Question 2

Why are prokaryotic cells easier to target with antibiotics than eukaryotic pathogens?

Accepted Answer

Prokaryotic cells are evolutionarily distant from human cells, allowing for more unique drug targets.

Question 3

Which antibiotic would be most effective against a bacterial infection by targeting the cell wall?

Accepted Answer

Penicillin

Question 4

A patient is prescribed a broad-spectrum antibiotic. What is a potential risk associated with this treatment?

Accepted Answer

It may disrupt the normal microbiota, leading to superinfection.

Question 5

Which of the following is NOT a characteristic of an ideal antimicrobial drug?

Accepted Answer

Rapidly induces resistance in microbes

Question 6

Which drug is most appropriate for targeting bacterial ribosomes?

Accepted Answer

Tetracycline

Question 7

Why are antifungal drugs generally more toxic to humans than antibacterial drugs?

Accepted Answer

Fungi are eukaryotes and share more similarities with human cells.

Question 8

Which of the following best explains why overuse of antibiotics can lead to drug resistance?

Accepted Answer

Antibiotics select for resistant bacteria by killing susceptible ones.

Question 9

A patient develops a secondary infection after antibiotic treatment. This is most likely due to:

Accepted Answer

Disruption of the normal microbiota, allowing opportunistic pathogens to grow.

Question 10

Which of the following drugs targets the bacterial plasma membrane?

Accepted Answer

Polymyxin B

Question 11

Which of the following is a reason why viruses are more difficult to target with drugs than bacteria?

Accepted Answer

Viruses use host cell machinery for replication, limiting unique drug targets.

Question 12

Which of the following is a narrow-spectrum antibiotic?

Accepted Answer

Penicillin

Question 13

Sulfa drugs inhibit which bacterial process?

Accepted Answer

Folic acid synthesis (enzyme inhibition)

Question 14

A hospital is experiencing an outbreak of multidrug-resistant tuberculosis (MDR-TB). Which of the following strategies is most effective in controlling the spread?

Accepted Answer

Ensuring patients complete their full course of prescribed antibiotics

Question 15

Which of the following best explains why a broad-spectrum antibiotic might be prescribed?

Accepted Answer

The infection is caused by an unknown organism and immediate treatment is necessary.

Question 16

Which of the following is a potential consequence of using antibiotics in animal feed?

Accepted Answer

Increased selection for antibiotic-resistant bacteria

Question 17

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

Accepted Answer

Enzymatic destruction or inactivation of the drug

Question 18

A patient is treated with an antibiotic that inhibits nucleic acid synthesis. Which drug is most likely being used?

Accepted Answer

Rifampin

Question 19

Which of the following best describes a superinfection?

Accepted Answer

An infection by an opportunistic pathogen after the normal microbiota is disrupted

Question 20

Which of the following is a reason why combination therapy is used to treat diseases like tuberculosis?

Accepted Answer

To target multiple pathways and reduce the chance of resistance

Antimicrobial Drugs: Principles, Targets, and Drug Resistance

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