Question 1

Which of the following best describes the overall chemical equation for aerobic cellular respiration in eukaryotic cells?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O}$$

Question 2

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

Accepted Answer

$$2$$

Question 3

Which stage of cellular respiration produces the greatest amount of ATP?

Accepted Answer

Oxidative Phosphorylation

Question 4

If oxygen is not available, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 5

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

Accepted Answer

$$\mathrm{O}_2$$

Question 6

What is the main purpose of the citric acid cycle in cellular respiration?

Accepted Answer

To generate electron carriers NADH and FADH$$_2$$

Question 7

Which of the following is a product of alcoholic fermentation by yeast?

Accepted Answer

Ethanol

Question 8

In the absence of oxygen, muscle cells convert pyruvate into which molecule?

Accepted Answer

Lactic acid

Question 9

Which of the following best explains why energy is lost as heat during cellular respiration?

Accepted Answer

Because some energy is converted to kinetic energy and dissipated

Question 10

Which of the following is the correct sequence of the three main metabolic pathways in aerobic cellular respiration?

Accepted Answer

Glycolysis → Citric Acid Cycle → Oxidative Phosphorylation

Question 11

Which molecule is regenerated at the end of the citric acid cycle to allow the cycle to continue?

Accepted Answer

Oxaloacetate

Question 12

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is most likely responsible for the continued production of ATP under these conditions?

Accepted Answer

Lactic acid fermentation

Question 13

Which of the following statements about ATP is correct?

Accepted Answer

ATP is formed by adding a phosphate group to ADP

Question 14

How many NADH molecules are produced per glucose molecule during the citric acid cycle (considering both turns of the cycle)?

Accepted Answer

$$6$$

Question 15

Which process directly uses the proton gradient across the mitochondrial inner membrane to synthesize ATP?

Accepted Answer

Oxidative Phosphorylation

Question 16

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

Accepted Answer

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

Question 17

Which metabolic pathway is shared by both aerobic respiration and fermentation?

Accepted Answer

Glycolysis

Question 18

A yeast cell is placed in an environment with no oxygen. Which products will accumulate as a result of its metabolism?

Accepted Answer

Ethanol and CO$$_2$$

Question 19

Which of the following best explains why the citric acid cycle must turn twice for each molecule of glucose?

Accepted Answer

Because each glucose produces two pyruvate molecules, each entering the cycle separately

Question 20

Which of the following is a real-world consequence of fermentation in yeast cells?

Accepted Answer

Formation of ethanol in alcoholic beverages

Cellular Respiration and Energy Harvesting in Cells

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