Question 1

Which of the following best describes the difference between potential energy and kinetic energy, as illustrated by a drawn bow and a released arrow?

Accepted Answer

Potential energy is stored due to position or state, while kinetic energy is the energy of motion.

Question 2

Which equation correctly represents the hydrolysis of ATP to ADP and inorganic phosphate?

Accepted Answer

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

Question 3

Which statement best explains the role of ATP in cellular metabolism?

Accepted Answer

ATP is a nucleotide that temporarily stores energy and can be recharged by adding a phosphate group to ADP.

Question 4

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

Accepted Answer

The breakdown of glucose into carbon dioxide and water during cellular respiration.

Question 5

In a redox reaction, what happens to the molecule that is oxidized?

Accepted Answer

It loses electrons and energy.

Question 6

Which electron carrier is used in cellular respiration and is reduced to its high-energy form?

Accepted Answer

NAD+, reduced to NADH

Question 7

What is the main function of enzymes in biological systems?

Accepted Answer

Enzymes act as biological catalysts, speeding up reactions by lowering activation energy.

Question 8

A patient has a fever of 41°C. Based on enzyme activity graphs, what is the likely effect on their enzymes?

Accepted Answer

Enzyme activity will decrease due to denaturation.

Question 9

Which of the following best describes the specificity of enzymes for their substrates?

Accepted Answer

Enzymes are highly specific due to the complementary shapes of the enzyme and substrate.

Question 10

Which scenario illustrates competitive inhibition of an enzyme?

Accepted Answer

An inhibitor competes with the substrate for binding to the active site of the enzyme.

Question 11

Feedback inhibition is best described as:

Accepted Answer

The product of a metabolic pathway inhibits an earlier enzyme in the pathway.

Question 12

Which of the following is true about the relationship between anabolism and catabolism?

Accepted Answer

Anabolism requires energy input, while catabolism releases energy.

Question 13

Which equation represents the reduction of NAD+ during a redox reaction?

Accepted Answer

$$\mathrm{NAD}^+ + 2\mathrm{H} \rightarrow \mathrm{NADH} + \mathrm{H}^+$$

Question 14

A scientist adds a competitive inhibitor to an enzyme reaction. What is the most likely outcome?

Accepted Answer

The inhibitor binds to the active site, preventing substrate binding and slowing the reaction.

Question 15

Which of the following is a real-life example of feedback inhibition?

Accepted Answer

Accumulation of isoleucine inhibits threonine deaminase in amino acid synthesis.

Question 16

If an enzyme is denatured by extreme pH, what happens to its activity?

Accepted Answer

The enzyme's activity decreases or stops.

Question 17

Which of the following best describes the role of electron carriers in metabolism?

Accepted Answer

Electron carriers transfer electrons and energy during redox reactions.

Question 18

A cell needs to temporarily stop producing a certain product. Which mechanism is most likely used?

Accepted Answer

The cell uses enzyme inhibition to temporarily stop the enzyme's activity.

Question 19

Which of the following is true about noncompetitive inhibition?

Accepted Answer

The inhibitor binds to a site other than the active site, changing the enzyme's shape and function.

Energy and Metabolism: Foundations of Cellular Biochemistry

Study Guide - Practice Questions