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

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

Question 1

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

Accepted Answer

To break down glucose and other molecules to produce ATP for cellular work

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 allosterically inhibited by high concentrations of ATP during glycolysis?

Accepted Answer

Phosphofructokinase

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 equations correctly represents the overall reaction for aerobic cellular respiration?

Accepted Answer

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

Question 6

What is the primary role of oxygen in cellular respiration?

Accepted Answer

To accept electrons at the end of the electron transport chain, forming water

Question 7

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

Accepted Answer

It produces ATP, NADH, FADH2, and CO2 as products

Question 8

A patient has a genetic defect that prevents the formation of the proton gradient across the inner mitochondrial membrane. Which process will be directly affected?

Accepted Answer

Oxidative phosphorylation

Question 9

Which of the following best explains why fermentation is less efficient than aerobic respiration?

Accepted Answer

Fermentation does not fully oxidize glucose, leaving energy in the waste products

Question 10

Which molecule is produced during pyruvate processing and enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 11

If a cell is exposed to a toxin that inhibits ATP synthase, what would be the immediate effect on cellular respiration?

Accepted Answer

ATP production by oxidative phosphorylation would decrease dramatically

Question 12

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

Accepted Answer

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

Question 13

Which of the following best describes the chemiosmotic hypothesis?

Accepted Answer

ATP is synthesized as protons flow down their electrochemical gradient through ATP synthase

Question 14

A yeast cell is placed in an anaerobic environment. Which end products would you expect to find after glucose metabolism?

Accepted Answer

Ethanol, CO2, and NAD+

Question 15

Which of the following statements about catabolic and anabolic pathways is true?

Accepted Answer

Catabolic pathways harvest energy to produce ATP, while anabolic pathways use ATP to build molecules

Question 16

Which of the following is a real-life example of feedback inhibition in cellular respiration?

Accepted Answer

High levels of ATP inhibit phosphofructokinase during glycolysis

Question 17

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

Accepted Answer

Oxygen allows for the largest difference in potential energy between electron donors and acceptors

Question 18

A person is exercising intensely and their muscle cells switch to lactic acid fermentation. What is the main reason for this metabolic shift?

Accepted Answer

Oxygen is not available to act as the final electron acceptor, so NAD+ must be regenerated by fermentation

Question 19

Which of the following molecules can be used as substrates for cellular respiration, entering at different points in the pathway?

Accepted Answer

Glucose, fatty acids, and amino acids

Cellular Respiration and Fermentation: Energy Production in Cells

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