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

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

Question 1

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

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, forming water.

Question 2

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

Accepted Answer

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

Question 3

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

Accepted Answer

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

Question 4

Which process in cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 5

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

Accepted Answer

It acts as an electron carrier, accepting electrons and becoming reduced to NADH.

Question 6

In the absence of oxygen, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 7

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 8

A patient is diagnosed with a mitochondrial disorder that impairs the function of ATP synthase. Which process would be most directly affected?

Accepted Answer

Chemiosmosis

Question 9

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

Accepted Answer

Fats have more hydrogen atoms, providing more electrons for the electron transport chain.

Question 10

During lactic acid fermentation, what is the fate of NADH produced in glycolysis?

Accepted Answer

NADH is oxidized back to NAD+ as pyruvate is reduced to lactate.

Question 11

Which of the following is a real-world example of substrate-level phosphorylation?

Accepted Answer

The direct transfer of a phosphate group from phosphoenolpyruvate (PEP) to ADP during glycolysis.

Question 12

A yeast cell is placed in an anaerobic environment. Which end product will accumulate as a result of fermentation?

Accepted Answer

Ethanol

Question 13

Which of the following best describes the chemiosmotic mechanism?

Accepted Answer

The use of a proton gradient across a membrane to drive ATP synthesis via ATP synthase.

Question 14

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

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 15

A mutation prevents the regeneration of NAD+ in a cell. Which process would be most immediately affected?

Accepted Answer

Glycolysis

Question 16

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

Accepted Answer

It completes the oxidation of glucose derivatives, producing NADH, FADH2, and ATP.

Question 17

Which of the following is a key evolutionary significance of glycolysis?

Accepted Answer

It is a universal pathway that likely evolved before the presence of oxygen in Earth's atmosphere.

Question 18

In a metabolic scenario, a cell is using fatty acids as its primary energy source. Which process is responsible for breaking down fatty acids into two-carbon fragments for entry into the citric acid cycle?

Accepted Answer

Beta oxidation

Question 19

Which of the following best explains why the actual ATP yield from cellular respiration is often less than the theoretical maximum of 32 ATP per glucose?

Accepted Answer

Some of the proton-motive force is used for work other than ATP synthesis, and electron shuttles may transfer electrons to FAD instead of NAD+.

Cellular Respiration and Fermentation: Energy Harvesting in Cells

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