Question 1

Which of the following is a major reason why it is difficult to develop antiviral drugs with selective toxicity?

Accepted Answer

Viruses use host cellular machinery for replication, making it hard to target the virus without harming the host.

Question 2

Beta-lactam antibiotics, such as penicillin, inhibit bacterial growth by interfering with which specific process?

Accepted Answer

Transpeptidation during cell wall synthesis

Question 3

A patient is infected with a Gram-negative bacterium that produces beta-lactamase. Which antibiotic would likely be most effective?

Accepted Answer

Cephalosporin

Question 4

Which equation best describes the relationship between plasma concentration of an antibiotic ($$C) $$and time ($$t) $$after intravenous administration, assuming first-order elimination kinetics?

Accepted Answer

$$C = C_0$ 	imes e$$^{-kt}$$

Question 5

Which of the following mechanisms allows bacteria to resist the effects of sulfa drugs?

Accepted Answer

Acquisition of folic acid from the environment

Question 6

Why do broad-spectrum antibiotics increase the risk of superinfection?

Accepted Answer

They kill nonresistant normal microbiota, allowing drug-resistant pathogens to proliferate.

Question 7

Which of the following is NOT a typical target for antimicrobial drugs?

Accepted Answer

Mitochondrial electron transport chain

Question 8

A bacterial strain is resistant to rifampin. Which resistance mechanism is most likely responsible?

Accepted Answer

Modification of RNA polymerase so rifampin cannot bind

Question 9

Which of the following statements about antimicrobial resistance is TRUE?

Accepted Answer

Most resistance is encoded on plasmids or other mobile genetic elements.

Question 10

Which combination therapy is used to overcome resistance to sulfa drugs?

Accepted Answer

Sulfa drugs + trimethoprim

Question 11

Which of the following best explains why fungal infections are difficult to treat?

Accepted Answer

Fungi are eukaryotes and share many cellular features with human cells.

Question 12

Which of the following antibiotics targets DNA gyrase, thereby inhibiting bacterial DNA replication?

Accepted Answer

Ciprofloxacin

Question 13

Which of the following is a potential virulence factor of Staphylococcus aureus that contributes to its ability to cause disease?

Accepted Answer

Production of beta-lactamase

Question 14

Which of the following is a reason why only about 1% of antibiotics isolated are clinically useful?

Accepted Answer

Most isolated antibiotics are toxic to human cells.

Question 15

Which of the following is a correct description of the mechanism of action of cephalosporins?

Accepted Answer

They inhibit cell wall synthesis by interfering with transpeptidation and are more resistant to beta-lactamases than penicillins.

Question 16

Which of the following is a real-world example of combination therapy used to treat HIV?

Accepted Answer

ART & HAART

Question 17

Which of the following best describes the action of Tamiflu?

Accepted Answer

It inhibits neuraminidase, preventing the release of influenza virus from infected cells.

Question 18

Which of the following is a plausible reason for the steady decline in new antimicrobial approvals by the FDA from 1983 to 2012?

Accepted Answer

Increasing difficulty in finding compounds with selective toxicity and low resistance potential.

Question 19

Which of the following is a feature of growth factor analogs such as sulfa drugs?

Accepted Answer

They mimic natural growth factors but do not function normally, disrupting cell metabolism.

Question 20

Which of the following strategies is used to discover new antibiotics from uncultured bacteria?

Accepted Answer

Screening for antibiotic activity in new environments

Antibiotics and Antibiotic Resistance: Mechanisms, Challenges, and New Developments

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