Q: Which equation correctly represents the phosphorylation of ADP to ATP?

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

Question 1

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

Accepted Answer

Catabolism releases energy by breaking down complex molecules, and anabolism uses that energy to build complex molecules from simpler ones; the two are coupled.

Question 2

According to the collision theory of chemical reactions, which factor directly increases the rate of reaction?

Accepted Answer

Increasing the frequency of collisions between reactant molecules.

Question 3

Which of the following best explains how enzymes speed up chemical reactions?

Accepted Answer

Enzymes lower the activation energy barrier, allowing reactions to proceed faster.

Question 4

A holoenzyme is composed of which of the following?

Accepted Answer

An apoenzyme (protein portion) and a cofactor (non-protein component).

Question 5

Which of the following coenzymes acts as an electron carrier in biological oxidation-reduction reactions?

Accepted Answer

NAD$$^{+}$$

Question 6

What is the role of the active site of an enzyme?

Accepted Answer

It is the region where the substrate binds and the chemical reaction occurs.

Question 7

Which of the following factors can denature an enzyme, rendering it inactive?

Accepted Answer

High temperature and extreme pH.

Question 8

A patient is given a drug that acts as a competitive inhibitor for a key metabolic enzyme. What is the most likely effect of this drug?

Accepted Answer

It binds to the active site, directly competing with the substrate and reducing enzyme activity.

Question 9

In feedback inhibition, the end product of a metabolic pathway acts as:

Accepted Answer

A non-competitive inhibitor that binds to an allosteric site, shutting down the pathway.

Question 10

Which of the following best describes oxidation in biological systems?

Accepted Answer

Loss of electrons and usually removal of hydrogen atoms.

Question 11

Which equation correctly represents the phosphorylation of ADP to ATP?

Accepted Answer

$$\mathrm{ADP} + 	ext{Energy} + \mathrm{P}_i ightarrow \mathrm{ATP}$$

Question 12

Which process generates ATP by transferring a high-energy phosphate group directly from a substrate to ADP?

Accepted Answer

Substrate-level phosphorylation

Question 13

During aerobic respiration, where does oxidative phosphorylation occur in eukaryotic cells?

Accepted Answer

Mitochondria

Question 14

Which of the following is true about fermentation?

Accepted Answer

It does not require oxygen and produces small amounts of ATP.

Question 15

What is the net gain of ATP molecules per molecule of glucose during glycolysis?

Accepted Answer

2 ATP

Question 16

In the overall reaction of glycolysis, which of the following is produced?

Accepted Answer

2 pyruvic acid, 2 NADH, and 2 ATP (net)

Question 17

Which metabolic process is responsible for the breakdown of lipids into fatty acids and glycerol?

Accepted Answer

Lipid catabolism

Question 18

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

Accepted Answer

ATP generation during glycolysis

Question 19

A mutation causes an enzyme to lose its allosteric site. Which regulatory mechanism would be most affected?

Accepted Answer

Feedback inhibition (end-product inhibition)

Question 20

Which of the following best describes chemiosmosis in cellular respiration?

Accepted Answer

Movement of electrons through the electron transport chain to generate a proton gradient, which drives ATP synthesis.

Essential Concepts of Metabolism (Chapter 5): Microbial Metabolic Pathways and Energy Production

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