Question 1

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

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 2

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 3

Which process in cellular respiration produces the majority of ATP?

Accepted Answer

Oxidative phosphorylation

Question 4

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

Accepted Answer

It serves as an electron acceptor, becoming reduced to NADH.

Question 5

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis produces pyruvate and occurs in the cytosol.

Question 6

Before entering the citric acid cycle, pyruvate must be converted to which molecule?

Accepted Answer

Acetyl CoA

Question 7

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 8

In the citric acid cycle, how many NADH molecules are produced per turn?

Accepted Answer

3

Question 9

What is the main purpose of the electron transport chain in mitochondria?

Accepted Answer

To pump protons across the inner mitochondrial membrane, creating a gradient used for ATP synthesis.

Question 10

Which statement best explains why fermentation produces much less ATP than aerobic respiration?

Accepted Answer

Fermentation does not utilize the electron transport chain or oxidative phosphorylation.

Question 11

Which of the following is TRUE about obligate anaerobes?

Accepted Answer

They cannot survive in the presence of oxygen and rely on fermentation or anaerobic respiration.

Question 12

Which of the following molecules can enter cellular respiration pathways at different points, besides glucose?

Accepted Answer

Carbohydrates, fats, and proteins

Question 13

What is the role of ATP synthase in cellular respiration?

Accepted Answer

It uses the proton gradient to synthesize ATP from ADP and inorganic phosphate.

Question 14

Which of the following best describes chemiosmosis?

Accepted Answer

The movement of protons down their concentration gradient through ATP synthase to generate ATP.

Question 15

If a cell's mitochondrial membrane becomes leaky, what is the most likely effect on ATP production?

Accepted Answer

ATP production will decrease because the proton gradient cannot be maintained.

Question 16

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

Accepted Answer

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

Question 17

Which phase of cellular respiration is responsible for the complete oxidation of glucose to CO2?

Accepted Answer

Citric acid cycle (Krebs cycle)

Question 18

Why is the number of ATP molecules produced per glucose variable in cellular respiration?

Accepted Answer

Due to factors such as leaky mitochondrial membranes, different electron transport chain paths, and the method of NADH transport into mitochondria.

Question 19

Which of the following is a key regulatory mechanism for cellular respiration?

Accepted Answer

Feedback inhibition of enzymes at strategic points in the pathway.

Question 20

A yeast cell is placed in an environment without oxygen. Which pathway will it use to generate ATP?

Accepted Answer

Alcohol fermentation

Cellular Respiration: Pathways and Production of ATP

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