Question 1

Which scientist is credited with discovering penicillin, leading to the development of the first widely used antibiotic?

Accepted Answer

Alexander Fleming

Question 2

Which of the following best describes selective toxicity in antimicrobial therapy?

Accepted Answer

The ability of a drug to target harmful microbes without damaging the host

Question 3

Beta-lactam antibiotics inhibit cell wall synthesis by interfering with which specific process?

Accepted Answer

Cross-linkage of NAM subunits in peptidoglycan

Question 4

Which equation correctly represents the calculation of the minimal inhibitory concentration (MIC) for an antibiotic?

Accepted Answer

$$MIC = \frac{Amount\ of\ antibiotic}{Volume\ of\ culture}$$

Question 5

Which of the following is a major reason for the development of antibiotic resistance in bacteria?

Accepted Answer

Using antibiotics for viral infections like the common cold

Question 6

A patient is prescribed two drugs that together produce a greater effect than either alone. What is this interaction called?

Accepted Answer

Synergism

Question 7

Which of the following antimicrobial agents disrupts the cytoplasmic membrane of Gram-negative bacteria and is toxic to human kidneys?

Accepted Answer

Polymyxin

Question 8

Which class of antiviral drugs inhibits the action of HIV reverse transcriptase?

Accepted Answer

Nucleoside analogs

Question 9

Which of the following mechanisms is NOT a way bacteria can acquire antibiotic resistance genes?

Accepted Answer

Direct uptake of antibiotics from the environment

Question 10

Which of the following statements about the spectrum of antimicrobial activity is correct?

Accepted Answer

Broad-spectrum drugs target a wide variety of pathogens

Question 11

Which enzyme is inhibited by sulfonamide drugs, affecting folic acid synthesis in bacteria?

Accepted Answer

Dihydropteroate synthase

Question 12

Which of the following is a correct statement about the action of nucleoside analogs?

Accepted Answer

They incorporate into viral DNA and prevent replication

Question 13

A patient is infected with a virus that uses CCR5 as a co-receptor for entry. Which drug class would be most effective in blocking viral attachment?

Accepted Answer

Block CCR5 drugs

Question 14

Which of the following is a plausible consequence of using antibiotics for non-bacterial infections?

Accepted Answer

Increased risk of antibiotic resistance

Question 15

Which of the following drugs acts by binding to tubulin and preventing microtubule formation, thus inhibiting helminth transmission?

Accepted Answer

Benzimidazoles

Question 16

Which of the following is a correct multi-step approach to treating HIV infection?

Accepted Answer

Use protease inhibitors and nucleoside analogs to block viral replication and maturation

Question 17

Which of the following is a correct formula for calculating the effectiveness of a drug combination showing synergism?

Accepted Answer

$$E_{synergism} \u003e E_{drug\ 1} + E_{drug\ 2}$$

Question 18

Which of the following is a reason why eukaryotic pathogens are more difficult to treat than prokaryotic pathogens?

Accepted Answer

Eukaryotic cells share more similarities with human cells

Question 19

Which of the following is a plausible effect of drugs that disrupt cytoplasmic membranes?

Accepted Answer

Loss of selective permeability and cell death

Question 20

Which of the following is a correct statement about the action of antiviral drugs targeting viral enzymes?

Accepted Answer

Protease inhibitors prevent viral protein maturation

Antimicrobial Agents: Mechanisms, History, and Resistance 20

Study Guide - Practice Questions