$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{ADP} + \mathrm{P}_i + \text{energy}$$

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 \rightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 32\ \mathrm{ATP} + \text{heat}$$

Question 1

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

Accepted Answer

Catabolism breaks down molecules to release energy, which is then used by anabolism to build macromolecules.

Question 2

During a redox reaction, which of the following statements is correct?

Accepted Answer

The electron donor is oxidized and the electron acceptor is reduced.

Question 3

Which molecule acts as an electron carrier by accepting two electrons and one proton, forming NADH?

Accepted Answer

NAD+

Question 4

What is the main function of ATP in cellular metabolism?

Accepted Answer

To provide immediate, usable energy for cellular processes

Question 5

Which of the following equations correctly represents the hydrolysis of ATP?

Accepted Answer

$$\mathrm{ATP} + \mathrm{H}_2\mathrm{O} ightarrow \mathrm{ADP} + \mathrm{P}_i + 	ext{energy}$$

Question 6

Which type of enzyme catalyzes the transfer of functional groups between molecules?

Accepted Answer

Transferase

Question 7

Apoenzymes require which of the following to become functional holoenzymes?

Accepted Answer

A cofactor, which may be an inorganic ion or a coenzyme

Question 8

Which of the following best explains why enzymes are highly specific for their substrates?

Accepted Answer

The active site of an enzyme has a unique shape that fits only specific substrates (induced fit model).

Question 9

Which of the following scenarios would most likely result in enzyme denaturation?

Accepted Answer

A temperature increase from 37°C to 90°C

Question 10

Which of the following statements about competitive inhibition is correct?

Accepted Answer

A competitive inhibitor binds to the active site, preventing substrate binding.

Question 11

In feedback inhibition, how does the end-product of a metabolic pathway regulate the pathway?

Accepted Answer

By acting as an allosteric inhibitor to an enzyme early in the pathway

Question 12

Which of the following is a correct summary equation for aerobic cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\mathrm{O}_2 ightarrow 6\mathrm{CO}_2 + 6\mathrm{H}_2\mathrm{O} + 32\ \mathrm{ATP} + 	ext{heat}$$

Question 13

Which process is responsible for the net gain of 2 ATP molecules during glycolysis?

Accepted Answer

Substrate-level phosphorylation

Question 14

Which of the following is NOT a product of the Krebs cycle for each turn?

Accepted Answer

2 FADH2

Question 15

In the electron transport chain, what is the primary role of oxygen in aerobic respiration?

Accepted Answer

To serve as the final electron acceptor, forming water

Question 16

Which pathway is used primarily to generate precursor metabolites for anabolic reactions, such as nucleotide synthesis?

Accepted Answer

Pentose phosphate pathway

Question 17

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ for glycolysis in the absence of oxygen.

Question 18

Which enzyme is responsible for hydrolyzing the bonds attaching fatty acid tails to glycerol during lipid catabolism?

Accepted Answer

Lipase

Question 19

Which process describes the synthesis of sugars from noncarbohydrate sources such as amino acids or glycerol?

Accepted Answer

Gluconeogenesis

Microbial Metabolism: Chemical Reactions, Pathways, and Regulation

Study Guide - Practice Questions