Question 1

Which of the following is NOT a characteristic of the ideal antimicrobial drug according to Table 12.1?

Accepted Answer

It does not disrupt the host's health by causing allergies or predisposing the host to other infections.

Question 2

Antibiotics are commonly produced by which of the following genera?

Accepted Answer

Streptomyces and Bacillus

Question 3

A drug that targets lipopolysaccharides in a gram-negative cell would be considered:

Accepted Answer

Selectively Toxic

Question 4

Which of the following best describes the mechanism of action for penicillins and cephalosporins?

Accepted Answer

Blockage of peptidoglycan synthesis

Question 5

Why are penicillins that do not penetrate the outer membrane less effective against gram-negative bacteria?

Accepted Answer

The outer membrane prevents access to the peptidoglycan layer.

Question 6

Which class of drugs acts by competitive inhibition, blocking the synthesis of folic acid in bacteria?

Accepted Answer

Sulfonamides

Question 7

Aminoglycosides are antibacterial drugs that target:

Accepted Answer

Protein synthesis

Question 8

Which of the following is a major side effect associated with tetracycline antibiotics?

Accepted Answer

Discoloration of tooth enamel

Question 9

What is the primary mode of action for beta-lactam antimicrobials?

Accepted Answer

Interference with cell wall synthesis

Question 10

Which generation of cephalosporins is most effective against gram-positive cocci and few gram-negative bacteria?

Accepted Answer

First generation

Question 11

Which drug is most effective in treating Staphylococcal infections when there is resistance to penicillin and methicillin?

Accepted Answer

Vancomycin

Question 12

Fluoroquinolones work by binding to which bacterial enzymes?

Accepted Answer

DNA gyrase and topoisomerase IV

Question 13

Which of the following is a mechanism by which bacteria acquire drug resistance?

Accepted Answer

Spontaneous mutations in chromosomal genes

Question 14

Which of the following mechanisms is NOT a way antiviral drugs act?

Accepted Answer

Killing extracellular viruses

Question 15

In the tube dilution test, the minimum inhibitory concentration (MIC) is defined as:

Accepted Answer

The smallest concentration of a drug required to inhibit growth

Question 16

Which of the following is a real-world example of a synergistic effect in antimicrobial therapy?

Accepted Answer

Sulfonamides and trimethoprim combined to block tetrahydrofolate synthesis

Question 17

Which of the following is a major adverse reaction associated with chloramphenicol?

Accepted Answer

Irreversible damage to bone marrow

Question 18

Which of the following is a reason why selective toxicity is difficult to achieve in antifungal chemotherapy?

Accepted Answer

Fungal cells are eukaryotic and similar to human cells

Question 19

Which of the following is a strategy to limit drug resistance in microorganisms?

Accepted Answer

Combined therapy with two or more drugs

Question 20

Which of the following is the correct formula for the therapeutic index (TI) of a drug?

Accepted Answer

$$TI = \frac{	ext{dose toxic to humans}}{	ext{minimum effective dose}}$$

Chapter 12: Drugs, Microbes, Host – The Elements of Chemotherapy

Guida di studio - Domande di pratica