Question 1

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

Accepted Answer

They act as biological catalysts by lowering the energy of activation and are not permanently altered in the reaction.

Question 2

A student is studying a metabolic pathway in which glucose is broken down into pyruvate, generating ATP and NADH. Which process is being described?

Accepted Answer

Glycolysis

Question 3

Which statement about catabolism and anabolism is correct?

Accepted Answer

Catabolism breaks bonds of larger molecules, releasing energy; anabolism forms larger macromolecules from smaller ones, requiring energy input.

Question 4

Which of the following is a correct example of substrate-level phosphorylation?

Accepted Answer

Transfer of a phosphate group from a phosphorylated substrate directly to ADP.

Question 5

A molecule has been reduced during a reaction. What has occurred?

Accepted Answer

It has gained electrons and hydrogens.

Question 6

Which of the following is NOT a function of metallic cofactors in enzyme activity?

Accepted Answer

Serve as temporary carriers for some substrates.

Question 7

During aerobic respiration, which step is responsible for the release of CO$$_2$$?

Accepted Answer

Krebs Cycle

Question 8

Which of the following best explains competitive inhibition of an enzyme?

Accepted Answer

A molecule resembling the substrate competes for binding at the active site.

Question 9

Which process in microbial metabolism uses organic compounds as the final electron acceptor and yields a small amount of ATP?

Accepted Answer

Fermentation

Question 10

What is the main job of chloroplast pigments during photosynthesis?

Accepted Answer

Capture photons of light.

Question 11

Which of the following statements about enzyme structure is correct?

Accepted Answer

Holoenzymes contain both protein and nonprotein molecules.

Question 12

Which of the following is a consequence of enzyme denaturation?

Accepted Answer

The enzyme's active site is destroyed, and it loses its catalytic activity.

Question 13

Which of the following is true about regulated enzymes?

Accepted Answer

They are produced or turned off in response to changes in substrate concentration.

Question 14

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

Accepted Answer

Molecular oxygen (O$$_2)$$

Question 15

Which of the following is a correct description of oxidative phosphorylation?

Accepted Answer

ATP is produced using energy released from redox reactions in the electron transport chain.

Question 16

Which of the following is a product of microbial fermentation?

Accepted Answer

Organic acids, alcohols, and gases

Question 17

Which metabolic process is responsible for converting pyruvic acid to acetyl CoA and CO$$_2$$?

Accepted Answer

Krebs cycle (specifically the linking reaction)

Question 18

Which of the following best describes chemiosmosis?

Accepted Answer

Diffusion of protons through ATP synthase, driving ATP production.

Question 19

Which of the following is true about ATP?

Accepted Answer

Removal of the terminal phosphate releases energy for cellular work.

Question 20

A bacterium is found to use nitrate (NO$$_3^-) as $$its final electron acceptor during respiration. Which type of metabolism is this?

Accepted Answer

Anaerobic respiration

Chapter 8-Microbial Metabolism and Enzyme Function: Tools of the Laboratory

Study Guide - Practice Questions