$$\text{ADP} + \text{P}_i \rightarrow \text{ATP}$$

$$\text{NAD}^+ + 2e^- + 2H^+ \rightarrow \text{NADH} + H^+$$

Question 1

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

Accepted Answer

Catabolism breaks down complex molecules to release energy, which is then used by anabolism to build complex molecules from simple ones.

Question 2

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

Accepted Answer

Two ATP and two NADH

Question 3

Which equation correctly represents substrate-level phosphorylation?

Accepted Answer

$$	ext{ADP} + 	ext{P}_i ightarrow 	ext{ATP}$$

Question 4

Which of the following is NOT a function of enzymes in metabolism?

Accepted Answer

Enzymes are consumed during the reaction and must be replenished.

Question 5

Apoenzymes require which of the following to become active holoenzymes?

Accepted Answer

A cofactor (inorganic ion or coenzyme)

Question 6

Which of the following best describes the process of oxidative phosphorylation?

Accepted Answer

ATP is produced as protons flow down their electrochemical gradient through ATP synthase, powered by electron transport chain redox reactions.

Question 7

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

Accepted Answer

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

Question 8

Which electron carrier is reduced to FADH2 during the Krebs cycle?

Accepted Answer

FAD

Question 9

In the electron transport chain, what is the primary function of the proton gradient?

Accepted Answer

To drive the phosphorylation of ADP to ATP via ATP synthase

Question 10

Which of the following is true about feedback inhibition in metabolic pathways?

Accepted Answer

Feedback inhibition slows or stops anabolic pathways when product is in abundance.

Question 11

Which of the following is NOT a type of enzyme inhibitor?

Accepted Answer

Substrate activator

Question 12

Which of the following equations represents the reduction of NAD+?

Accepted Answer

$$	ext{NAD}^+ + 2e^- + 2H^+ ightarrow 	ext{NADH} + H^+$$

Question 13

Which pathway provides cells with an alternate source of NAD+ when cellular respiration cannot completely oxidize glucose?

Accepted Answer

Fermentation

Question 14

Which of the following is a key reaction in the Calvin-Benson cycle?

Accepted Answer

Carbon fixation

Question 15

Which of the following statements about the location of the Krebs cycle is correct?

Accepted Answer

It occurs in the cytosol of prokaryotes and in the matrix of mitochondria in eukaryotes.

Question 16

Which of the following is NOT a product of the Krebs cycle per glucose molecule?

Accepted Answer

Eight molecules of FADH2

Question 17

Which process is responsible for the greatest production of ATP in cellular respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 18

Which of the following statements about photosynthesis is correct?

Accepted Answer

Photosynthesis uses light energy to synthesize carbohydrates from CO2 and H2O.

Question 19

Which of the following is a characteristic of amphibolic pathways?

Accepted Answer

They can function in both anabolic and catabolic reactions.

Microbial Metabolism: Chemical Reactions and Pathways

Study Guide - Practice Questions