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

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

Question 1

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

Accepted Answer

To break down glucose and harvest energy to produce ATP

Question 2

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

Which enzyme is regulated by feedback inhibition in glycolysis, and how does ATP regulate its activity?

Accepted Answer

Phosphofructokinase; ATP binds to a regulatory site and inhibits the enzyme

Question 4

In the absence of oxygen, which process allows glycolysis to continue by regenerating $$NAD^+$$?

Accepted Answer

Fermentation

Question 5

Which of the following is a correct sequence of the four main stages of cellular respiration?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport and oxidative phosphorylation

Question 6

What is the final electron acceptor in aerobic cellular respiration, and what is produced as a result?

Accepted Answer

Oxygen; water

Question 7

Which of the following statements about the citric acid cycle is TRUE?

Accepted Answer

It produces ATP, NADH, FADH$$_2$$, and CO$$_2$$

Question 8

A patient is diagnosed with a mitochondrial disorder that impairs the function of the electron transport chain. Which of the following would most likely be observed in their cells?

Accepted Answer

Accumulation of NADH and FADH$$_2$$

Question 9

Which of the following best explains why fats yield more ATP per gram than carbohydrates when used as fuel in cellular respiration?

Accepted Answer

Fatty acids have more C-H bonds, providing more electrons for the electron transport chain

Question 10

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

Accepted Answer

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

Question 11

A muscle cell is deprived of oxygen during intense exercise. Which metabolic pathway will it rely on to continue producing ATP, and what is the main byproduct?

Accepted Answer

Lactic acid fermentation; lactate

Question 12

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

ATP is produced by the transfer of a phosphate group from a substrate to ADP

Question 13

Which of the following is NOT a product of the citric acid cycle per turn (per acetyl CoA)?

Accepted Answer

Glucose

Question 14

What is the main function of the proton gradient established by the electron transport chain in mitochondria?

Accepted Answer

To drive the synthesis of ATP via ATP synthase

Question 15

Which of the following statements about fermentation is TRUE?

Accepted Answer

Fermentation regenerates $$NAD^+ so $$glycolysis can continue

Question 16

A cell is exposed to a toxin that inhibits ATP synthase. What immediate effect would this have on the cell's metabolism?

Accepted Answer

The proton gradient would dissipate, and ATP production by oxidative phosphorylation would decrease

Question 17

Which of the following best explains why oxygen is such an effective final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen is highly electronegative, allowing it to pull electrons down the chain and form water

Question 18

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

Accepted Answer

Catabolic pathways break down molecules to release energy, while anabolic pathways use energy to build large molecules

Question 19

Which of the following statements about the regulation of cellular respiration is correct?

Accepted Answer

High levels of ATP inhibit key enzymes in glycolysis and pyruvate processing

Question 20

A facultative anaerobe is placed in an environment with no oxygen. Which pathway will it primarily use to generate ATP?

Accepted Answer

Fermentation

Cellular Respiration and Fermentation: Energy Production in Cells

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