Question 1

Which of the following best describes the difference between catabolism and anabolism in microbial metabolism?

Accepted Answer

Catabolism involves the breakdown of molecules to release energy, while anabolism uses energy to build complex molecules.

Question 2

A bacterium that uses light as its energy source and organic compounds as its carbon source is classified as which of the following?

Accepted Answer

Photoheterotroph

Question 3

Which of the following factors does NOT directly affect the rate of an enzymatic reaction?

Accepted Answer

The color of the substrate

Question 4

A patient’s wound culture is tested with the oxidase test. What is the main purpose of this test?

Accepted Answer

To determine if the microbe produces cytochrome c oxidase, indicating its ability to use oxygen as a terminal electron acceptor.

Question 5

During protein catabolism, which of the following is the correct sequence of events?

Accepted Answer

Proteins are hydrolyzed to amino acids, which are then deaminated and converted into intermediates of glycolysis or the Krebs cycle.

Question 6

Which of the following statements best explains why knowledge of microbial metabolism is important in medicine?

Accepted Answer

It helps in selecting appropriate antimicrobial therapies by targeting specific metabolic pathways unique to microbes.

Question 7

Which phase of the bacterial growth curve is most clinically relevant for determining the effectiveness of antibiotics that target cell wall synthesis?

Accepted Answer

Log (exponential) phase

Question 8

A microbe that grows only at the bottom of a thioglycollate broth tube is most likely which of the following?

Accepted Answer

Obligate anaerobe

Question 9

Which enzyme is responsible for breaking down hydrogen peroxide ($$2H_2O_2) $$into water and oxygen, and is typically found in obligate aerobes?

Accepted Answer

Catalase

Question 10

A bacterium that grows optimally at $$55^\circ C$$ and can survive at temperatures up to $$70^\circ C is $$classified as which of the following?

Accepted Answer

Thermophile

Question 11

Which of the following best describes an obligate halophile?

Accepted Answer

A microbe that requires high salt concentrations for growth due to osmotic adaptation.

Question 12

Which of the following terms refers to the complete removal or destruction of all forms of microbial life, including endospores?

Accepted Answer

Sterilization

Question 13

Which of the following is an example of a -cidal treatment?

Accepted Answer

Autoclaving surgical instruments

Question 14

Which of the following is a physical method of microbial control?

Accepted Answer

Filtration

Question 15

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

Accepted Answer

Development of a superinfection due to disruption of normal microbiota

Question 16

Which mechanism of action is most likely for an antibacterial drug that inhibits peptidoglycan synthesis?

Accepted Answer

Inhibition of cell wall biosynthesis

Question 17

Which of the following best explains why viruses are not affected by antibiotics that target cell wall synthesis?

Accepted Answer

Viruses lack a cell wall and rely on host cell machinery for replication.

Question 18

A hospital-acquired strain of Staphylococcus aureus becomes resistant to methicillin after acquiring a resistance gene from another bacterium via a pilus. Which process is responsible for this gene transfer?

Accepted Answer

Conjugation

Question 19

Which of the following is NOT a mechanism by which bacteria develop resistance to antimicrobial drugs?

Accepted Answer

Increasing the permeability of the cell membrane to the drug

Question 20

A patient is prescribed two antibiotics that, when used together, result in a greater effect than either alone. What is this interaction called, and why is it clinically significant?

Accepted Answer

Synergism; it can enhance treatment efficacy and reduce the likelihood of resistance.

Microbial Metabolism, Growth, Control, and Antimicrobial Drugs – Study Guide

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