Question 1

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

Accepted Answer

Catabolism releases energy by breaking down molecules, and anabolism uses that energy to build complex molecules.

Question 2

Which of the following is a correct statement about enzymes?

Accepted Answer

Enzymes are specific to their substrates and are not used up in the reaction.

Question 3

Which of the following factors does NOT influence enzyme activity?

Accepted Answer

The color of the enzyme

Question 4

A competitive inhibitor works by:

Accepted Answer

Binding to the active site and preventing substrate binding.

Question 5

Which of the following is true about oxidation-reduction (redox) reactions?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 6

Which of the following best describes the function of metabolic pathways?

Accepted Answer

They are sequences of enzyme-catalyzed reactions that transform substrates into products.

Question 7

Which of the following statements about aerobic and anaerobic respiration is correct?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses inorganic molecules such as nitrate or sulfate.

Question 8

Which of the following is a product of fermentation in microorganisms?

Accepted Answer

Lactic acid

Question 9

How is ATP generated during substrate-level phosphorylation?

Accepted Answer

By direct transfer of a phosphate group to ADP from a phosphorylated intermediate.

Question 10

Which of the following best explains why feedback inhibition is a form of noncompetitive inhibition?

Accepted Answer

The end product binds to a regulatory (allosteric) site, changing the enzyme's shape and activity.

Question 11

Which of the following is a coenzyme involved in redox reactions in cellular respiration?

Accepted Answer

NAD+

Question 12

What happens to an enzyme when it is exposed to temperatures above its optimal range?

Accepted Answer

It is denatured and loses its functional shape.

Question 13

Which of the following is the correct formula for cellular respiration?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP}$$

Question 14

Which of the following is true about the electron transport chain (ETC) in aerobic respiration?

Accepted Answer

Electrons are transferred from NADH and FADH2 to oxygen, generating a proton gradient used to synthesize ATP.

Question 15

Which of the following is a correct statement about fermentation?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor.

Question 16

Which of the following is a likely consequence if a bacterium's enzyme is denatured by high temperature?

Accepted Answer

The enzyme will lose its three-dimensional structure and become inactive.

Question 17

Which of the following is a product of glycolysis?

Accepted Answer

Pyruvic acid

Question 18

Which of the following best explains why sulfa drugs are effective antibiotics?

Accepted Answer

They inhibit folate synthesis in bacteria by acting as competitive inhibitors of DHPS.

Question 19

Which of the following statements about anaerobic respiration is correct?

Accepted Answer

It uses inorganic molecules such as sulfate or nitrate as the final electron acceptor.

Microbial Metabolism: Structured Study Notes for Microbiology Students

Study Guide - Practice Questions