Question 1

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores energy released from catabolic reactions and provides energy for anabolic reactions.

Question 2

Which of the following statements about enzymes is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to occur.

Question 3

Apoenzyme, cofactor, and holoenzyme are terms used to describe enzyme structure. Which statement is true?

Accepted Answer

A holoenzyme consists of an apoenzyme plus its cofactor.

Question 4

Which of the following is an example of a catabolic reaction?

Accepted Answer

Breakdown of starch into glucose molecules

Question 5

Which factor does NOT directly affect enzyme activity?

Accepted Answer

Oxygen concentration

Question 6

A competitive inhibitor affects an enzyme by:

Accepted Answer

Binding to the active site and preventing substrate binding

Question 7

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

A reaction where one molecule loses electrons and another gains electrons

Question 8

In substrate-level phosphorylation, ATP is generated by:

Accepted Answer

Direct transfer of a phosphate group to ADP from an intermediate substrate

Question 9

Which pathway is used by some bacteria as an alternative to glycolysis and produces NADPH and ATP but does NOT involve glycolysis?

Accepted Answer

Entner-Doudoroff pathway

Question 10

During aerobic respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen (O$$_2)$$

Question 11

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation uses an organic molecule as the final electron acceptor.

Question 12

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactic acid

Question 13

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 14

Which of the following best describes an amphibolic pathway?

Accepted Answer

A pathway that has both catabolic and anabolic functions

Question 15

Which coenzyme is primarily involved in catabolic reactions as an electron carrier?

Accepted Answer

NAD$$^+$$

Question 16

A bacterium is growing in an environment with no oxygen and uses nitrate (NO$$_3^-) as $$the final electron acceptor. This is an example of:

Accepted Answer

Anaerobic respiration

Question 17

Which of the following is NOT a function of coenzymes?

Accepted Answer

Providing structural support to the cell

Question 18

Which of the following best explains why increasing substrate concentration increases enzyme activity only up to a certain point?

Accepted Answer

All active sites on the enzyme molecules become saturated with substrate.

Question 19

Which of the following is a real-life application of feedback inhibition in metabolic pathways?

Accepted Answer

The end-product of a pathway binds to an allosteric site on the first enzyme, shutting down the pathway.

Question 20

Which of the following equations correctly represents the generation of ATP from ADP?

Accepted Answer

$$\mathrm{ADP} + \mathrm{P_i} + 	ext{energy} ightarrow \mathrm{ATP}$$

Microbial Metabolism: An Overview of Biochemical Pathways and Enzyme Function

Study Guide - Practice Questions