Q: Which equation represents the overall process of aerobic cellular respiration?

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

Question 1

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

Accepted Answer

Oxygen is the final electron acceptor, allowing electrons to combine with protons to form water.

Question 2

During glycolysis, what is the net yield of ATP and NADH per molecule of glucose?

Accepted Answer

2 ATP and 2 NADH

Question 3

Which equation represents the overall process of aerobic cellular respiration?

Accepted Answer

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

Question 4

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

Accepted Answer

Citric acid cycle

Question 5

What is the primary goal of fermentation in cells?

Accepted Answer

To regenerate NAD+ so glycolysis can continue

Question 6

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 by an enzyme.

Question 7

In humans, which molecule is produced as a waste product during lactic acid fermentation?

Accepted Answer

Lactate

Question 8

Which enzyme is allosterically regulated by ATP during glycolysis, and what is the effect of high ATP levels?

Accepted Answer

Phosphofructokinase; high ATP inhibits its activity

Question 9

Which of the following best explains why the actual ATP yield from cellular respiration is lower than the theoretical maximum?

Accepted Answer

The proton motive force is used for other mitochondrial activities besides ATP synthesis.

Question 10

Which metabolic pathway is most likely to be upregulated in brown adipose tissue when uncoupling proteins are active?

Accepted Answer

Heat production

Question 11

During the citric acid cycle, acetyl CoA combines with which molecule to begin the cycle?

Accepted Answer

Oxaloacetate

Question 12

Which of the following is a correct description of chemiosmosis?

Accepted Answer

The flow of protons down their electrochemical gradient through ATP synthase drives ATP synthesis.

Question 13

Which of the following molecules contains most of the original energy from glucose after glycolysis and the citric acid cycle?

Accepted Answer

NADH and FADH2

Question 14

Which of the following is NOT a product of the complete oxidation of one molecule of glucose in aerobic respiration?

Accepted Answer

Lactate

Question 15

Which process occurs in the cytosol of eukaryotic cells?

Accepted Answer

Glycolysis

Question 16

What happens to the amino group when proteins are catabolized for energy?

Accepted Answer

It is removed and excreted as waste (deamination).

Question 17

Which of the following best describes the relationship between catabolic and anabolic pathways in metabolism?

Accepted Answer

Catabolic and anabolic pathways are tightly intertwined and often coupled to maintain homeostasis.

Question 18

Which of the following is a direct result of feedback inhibition in cellular respiration?

Accepted Answer

Enzyme activity decreases when ATP or NADH levels are abundant.

Question 19

Which of the following is a correct sequence of events in aerobic cellular respiration?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport chain

Question 20

Which of the following best explains why facultative organisms seldom ferment pyruvate if the electron acceptor at the end of the ETC is readily available?

Accepted Answer

Cellular respiration is more efficient at ATP production than fermentation.

Cellular Respiration and Fermentation: Metabolic Pathways and Energy Production

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