Question 1

Which of the following best describes a catabolic reaction in microbial metabolism?

Accepted Answer

A reaction that breaks down complex molecules to release energy

Question 2

What is the primary role of ATP in coupling anabolic and catabolic reactions?

Accepted Answer

ATP transfers energy from catabolic reactions to anabolic reactions

Question 3

Which of the following is NOT a component of a holoenzyme?

Accepted Answer

Substrate

Question 4

A competitive inhibitor affects enzyme activity by:

Accepted Answer

Binding to the active site and blocking substrate binding

Question 5

Which equation correctly represents the net ATP yield from aerobic respiration of one glucose molecule in bacteria?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + 38ATP$$

Question 6

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

2 ATP

Question 7

Which process uses light energy to generate ATP in photosynthetic microorganisms?

Accepted Answer

Photophosphorylation

Question 8

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation can occur in the absence of oxygen and produces small amounts of ATP

Question 9

Which enzyme class is responsible for transferring functional groups between molecules?

Accepted Answer

Transferase

Question 10

A bacterium is found to lack genes encoding enzymes for the electron transport chain. Which metabolic process is it UNABLE to perform?

Accepted Answer

Aerobic respiration

Question 11

Which of the following is a correct description of oxidation in a redox reaction?

Accepted Answer

Loss of electrons

Question 12

Which metabolic pathway is used by both lipid and protein catabolism to generate energy?

Accepted Answer

Krebs Cycle

Question 13

Which of the following is a unique property of ribozymes compared to other enzymes?

Accepted Answer

They are made of RNA and catalyze RNA splicing

Question 14

Which factor does NOT directly influence enzyme activity?

Accepted Answer

Osmotic pressure

Question 15

In the electron transport chain, what is the main purpose of the transfer of electrons?

Accepted Answer

To produce ATP via oxidative phosphorylation

Question 16

Which metabolic type uses light as an energy source and CO$$_2 as a $$carbon source?

Accepted Answer

Photoautotroph

Question 17

A microorganism is found to produce lactic acid and CO$$_2 in $$the absence of oxygen. Which metabolic process is most likely occurring?

Accepted Answer

Lactic acid fermentation

Question 18

Which of the following is TRUE regarding the Calvin-Benson cycle?

Accepted Answer

It uses ATP generated by photophosphorylation to fix CO$$_2$$ into sugars

Question 19

Which of the following is a plausible consequence of denaturing an enzyme by high temperature?

Accepted Answer

The enzyme's active site loses its specific shape, reducing activity

Question 20

A bacterium is classified as a chemoheterotroph. Which of the following best describes its energy and carbon sources?

Accepted Answer

Chemicals and organic compounds

Microbial Metabolism: Enzymes, Energy, and Metabolic Pathways

Study Guide - Practice Questions