Question 1

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, allowing for the production of water.

Question 2

During photosynthesis, which equation correctly represents the overall process occurring in plants?

Accepted Answer

$$ \mathrm{CO_2$} + \mathrm{H_2O} \rightarrow \mathrm{C_6H_{12}O_6$} + \mathrm{O_2$} $$

Question 3

Which of the following is NOT a requirement for energy in living organisms?

Accepted Answer

Energy must be released only as heat.

Question 4

Which stage of catabolism involves the oxidation of Acetyl-CoA to produce $$ \mathrm{CO_2$} $$ and reduced coenzymes?

Accepted Answer

Stage III: Acetyl-CoA oxidized to produce $$ \mathrm{CO_2$} $$ and reduced coenzymes

Question 5

Which principle of metabolic pathways explains why glycolysis occurs in the cytosol and the TCA cycle in the mitochondrial matrix?

Accepted Answer

Pathways in eukaryotic cells occur in specific cellular locations.

Question 6

Which of the following statements about ATP is FALSE?

Accepted Answer

ATP can be hydrolyzed without an enzyme.

Question 7

Why is ATP considered a good energy source for cells?

Accepted Answer

Its phosphate bonds are easily cleaved due to repulsion between negative charges.

Question 8

Which of the following is a correct example of coupling an endergonic reaction with an exergonic reaction in metabolism?

Accepted Answer

ATP hydrolysis drives the phosphorylation of glucose during glycolysis.

Question 9

Which coenzyme is derived from niacin (vitamin B3) and is essential for redox reactions?

Accepted Answer

NAD+/NADH

Question 10

Which of the following best describes a cyclic metabolic sequence?

Accepted Answer

A pathway that regenerates its initial substrate in the last reaction.

Question 11

Which statement about spiral sequences in metabolism is correct?

Accepted Answer

One enzyme or group of enzymes breaks down a polymer one monomer at a time.

Question 12

Which of the following is NOT a high energy molecule produced or used in metabolic processes?

Accepted Answer

Glucose

Question 13

Which vitamin is required for the synthesis of Acetyl-CoA?

Accepted Answer

Pantothenic acid (B5)

Question 14

Which of the following reactions is exergonic?

Accepted Answer

$$ \mathrm{ATP} \rightarrow \mathrm{ADP} + \mathrm{$$HPO_4$$^{2-}} + \mathrm{H^+} $$

Question 15

Which of the following statements about metabolic pathway regulation is TRUE?

Accepted Answer

Regulation prevents the buildup of metabolites and energy waste.

Question 16

Which cellular location is correctly matched with its metabolic pathway?

Accepted Answer

Electron transport chain: inner mitochondrial membrane

Question 17

Which of the following is a committed step in a metabolic pathway?

Accepted Answer

A step that is highly regulated and often irreversible.

Question 18

Which of the following is a function of NAD+/NADH in metabolism?

Accepted Answer

Redox reactions as an electron carrier

Question 19

Which statement best explains why AMP is not easily cleaved compared to ATP?

Accepted Answer

AMP has no repulsion between negative charges on oxygens.

Question 20

Which of the following best describes the overall reaction for cellular respiration?

Accepted Answer

$$ \mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy} $$

Metabolic Pathways, Energy, and Carbohydrates in Biochemical Chemistry

Study Guide - Practice Questions