Question 1

Which of the following best describes the main function of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and generate ATP for cellular work

Question 2

During aerobic cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

O$$_2$$

Question 3

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

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6\ \mathrm{O}_2 ightarrow 6\ \mathrm{CO}_2 + 6\ \mathrm{H}_2\mathrm{O} + 	ext{Energy (ATP + heat)}$$

Question 4

Which process occurs in the cytosol of both prokaryotic and eukaryotic cells and does NOT require oxygen?

Accepted Answer

Glycolysis

Question 5

What is the net gain of ATP molecules produced directly by glycolysis from one molecule of glucose?

Accepted Answer

2 ATP

Question 6

Which of the following statements about NAD$$^+$$ and NADH is TRUE?

Accepted Answer

NADH is the reduced form and stores energy for ATP synthesis.

Question 7

In the absence of oxygen, muscle cells can continue to produce ATP by converting pyruvate into which molecule?

Accepted Answer

Lactic acid

Question 8

Which of the following best explains why fats yield more ATP per gram than carbohydrates during cellular respiration?

Accepted Answer

Fats are more highly reduced and have more hydrogen atoms available for oxidation.

Question 9

Which process directly generates the majority of ATP during aerobic cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 10

A poison that blocks the function of ATP synthase would directly inhibit which process?

Accepted Answer

Chemiosmosis

Question 11

Which of the following is a correct sequence of events for the flow of electrons during aerobic respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ Electron transport chain $$\rightarrow$$ Oxygen

Question 12

Which of the following is a key difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient and ATP synthase.

Question 13

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

Accepted Answer

It is the final electron acceptor in the electron transport chain.

Question 14

Which of the following is a product of the citric acid cycle that is used in the electron transport chain?

Accepted Answer

NADH

Question 15

A patient is diagnosed with a genetic disorder that prevents the removal of amino groups from amino acids. Which stage of cellular respiration would be most directly affected?

Accepted Answer

Citric acid cycle

Question 16

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD$$^+.$$

Question 17

Which of the following best explains why lactic acid builds up in muscle cells during intense exercise?

Accepted Answer

Oxygen is limited, so cells switch to fermentation to regenerate NAD$$^+.$$

Question 18

Which of the following molecules can enter cellular respiration at multiple points, including glycolysis and the citric acid cycle, after appropriate modification?

Accepted Answer

Fats, proteins, and carbohydrates

Question 19

Which of the following is an example of an anabolic pathway?

Accepted Answer

Synthesis of glycogen from glucose

Question 20

A bacterium living in a low-oxygen environment uses nitrate (NO$$_3^-) as $$its final electron acceptor. Which process is this an example of?

Accepted Answer

Anaerobic respiration

Cellular Respiration and Fermentation: Pathways of Energy Production

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