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

Question 1

Which of the following best describes the overall chemical equation for 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 2

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

Accepted Answer

Oxygen ($\mathrm{O}_2$)

Question 3

Which process produces the greatest number of ATP molecules per glucose molecule?

Accepted Answer

Aerobic respiration

Question 4

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

Accepted Answer

To function as an electron carrier and oxidizing agent

Question 5

Which step of cellular respiration occurs in the cytosol of eukaryotic cells?

Accepted Answer

Glycolysis

Question 6

In glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$2$

Question 7

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group from a substrate to ADP.

Question 8

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

Accepted Answer

$3$

Question 9

Which of the following best explains why fats produce more ATP per gram than carbohydrates?

Accepted Answer

Fats have more high-energy electrons and hydrogen atoms available for oxidation.

Question 10

What is the role of the proton-motive force in oxidative phosphorylation?

Accepted Answer

It provides the energy for ATP synthase to synthesize ATP from ADP and $\mathrm{P}_i$.

Question 11

Which of the following is a correct description of lactic acid fermentation?

Accepted Answer

Pyruvate is reduced directly by NADH to form lactate.

Question 12

In feedback inhibition of cellular respiration, what happens when ATP levels are high?

Accepted Answer

Respiration slows down to prevent wasteful ATP production.

Question 13

Which of the following is NOT a product of the citric acid cycle per glucose molecule?

Accepted Answer

2 Pyruvate

Question 14

Which molecule is oxidized during glycolysis?

Accepted Answer

Glucose

Question 15

What is the main difference between fermentation and anaerobic respiration?

Accepted Answer

Anaerobic respiration uses an electron transport chain with a final electron acceptor other than oxygen.

Question 16

Which of the following is a real-world example of alcohol fermentation?

Accepted Answer

Baking bread using yeast

Question 17

If a cell is deprived of oxygen, which process will continue to produce ATP?

Accepted Answer

Glycolysis

Question 18

Which of the following is a correct sequence of energy flow during cellular respiration?

Accepted Answer

Glucose $\rightarrow$ NADH $\rightarrow$ electron transport chain $\rightarrow$ proton-motive force $\rightarrow$ ATP

Question 19

Which of the following macromolecules can be used as fuel in cellular respiration, and what must happen to proteins before they enter the pathway?

Accepted Answer

Carbohydrates, fats, and proteins; proteins must be deaminated.

Question 20

Which of the following statements about chemiosmosis is correct?

Accepted Answer

It uses the energy of a proton gradient to drive the synthesis of ATP.

Cellular Respiration and Fermentation: Study Notes

Study Guide - Practice Questions