Q: Which of the following equations correctly represents the overall reaction of cellular respiration?

$$\mathrm{C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy}}$$

Question 1

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

Accepted Answer

It uses the energy from electrons to pump H+ ions across a membrane, creating a gradient that drives ATP synthesis.

Question 2

During cellular respiration, which molecule is oxidized and which is reduced in the overall reaction $$\mathrm{C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy}}$$?

Accepted Answer

Glucose is oxidized; oxygen is reduced.

Question 3

Which stage of cellular respiration produces the most NADH per glucose molecule?

Accepted Answer

Citric acid cycle

Question 4

What is the primary function of NAD+ in cellular respiration?

Accepted Answer

To carry electrons from food molecules to the electron transport chain.

Question 5

Which process directly generates ATP using a proton gradient across a membrane?

Accepted Answer

Chemiosmosis

Question 6

In the context of cellular respiration, why is oxygen considered an excellent energy electron acceptor?

Accepted Answer

Because it has a high affinity for electrons, allowing maximum energy extraction from fuel molecules.

Question 7

Which of the following equations correctly represents the overall reaction of cellular respiration?

Accepted Answer

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

Question 8

Substrate-level phosphorylation occurs during which stages of cellular respiration?

Accepted Answer

Glycolysis and citric acid cycle

Question 9

A patient is diagnosed with a genetic defect that impairs the function of dehydrogenase enzymes. Which step of cellular respiration would be most directly affected?

Accepted Answer

Extraction of electrons and protons from food molecules

Question 10

Which molecule is formed when glucose is split during glycolysis?

Accepted Answer

Pyruvate

Question 11

If the electron transport chain in mitochondria is inhibited, which of the following would most likely occur?

Accepted Answer

The proton gradient across the inner mitochondrial membrane would decrease.

Question 12

Which of the following is a direct product of the citric acid cycle per glucose molecule?

Accepted Answer

6 NADH

Question 13

What is the main reason cellular respiration releases energy gradually rather than all at once?

Accepted Answer

To prevent the cell from overheating and to efficiently capture energy in ATP.

Question 14

Which of the following best explains why organic molecules are considered excellent fuel sources for cellular respiration?

Accepted Answer

They contain many high-energy electrons associated with hydrogen atoms.

Question 15

During glycolysis, which enzyme is responsible for extracting electrons from glucose?

Accepted Answer

Dehydrogenase

Question 16

Which of the following is TRUE about the conversion of pyruvate to acetyl-CoA?

Accepted Answer

It produces NADH and releases CO2.

Question 17

A mutation prevents NAD+ from being reduced to NADH. What is the most immediate consequence for cellular respiration?

Accepted Answer

Glycolysis would stop because electrons could not be transferred.

Question 18

Which of the following steps in cellular respiration occurs in the cytosol?

Accepted Answer

Glycolysis

Question 19

Which molecule acts as the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

Oxygen

Cellular Respiration and ATP Production: Mechanisms and Stages

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