Q: Which of the following best describes the overall chemical equation for cellular respiration?

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

Question 1

Which of the following best describes the overall chemical equation for cellular respiration?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6\ 	ext{O}_2 ightarrow 6\ 	ext{CO}_2 + 6\ 	ext{H}_2	ext{O} + 	ext{Energy}$$

Question 2

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

$$	ext{O}_2$$

Question 3

Which process produces the greatest amount of ATP per glucose molecule?

Accepted Answer

Aerobic respiration

Question 4

What is the net gain of ATP molecules from glycolysis per molecule of glucose?

Accepted Answer

$$2$$

Question 5

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 6

In the citric acid cycle, how many NADH molecules are produced per turn of the cycle?

Accepted Answer

$$3$$

Question 7

Which enzyme catalyzes the conversion of pyruvate to acetyl CoA?

Accepted Answer

Pyruvate dehydrogenase

Question 8

What is the main purpose of the electron transport chain in cellular respiration?

Accepted Answer

To create a proton gradient for ATP synthesis

Question 9

Which of the following is true about substrate-level phosphorylation?

Accepted Answer

It involves the direct transfer of a phosphate group to ADP by an enzyme.

Question 10

A patient is diagnosed with a genetic defect that prevents the formation of FADH$$_2$$ during the citric acid cycle. Which of the following would most likely occur?

Accepted Answer

ATP production via oxidative phosphorylation would decrease.

Question 11

Which molecule is regenerated during fermentation to allow glycolysis to continue in the absence of oxygen?

Accepted Answer

$$	ext{NAD}^+$$

Question 12

Which of the following is a major difference between fermentation and cellular respiration?

Accepted Answer

Cellular respiration produces more ATP per glucose molecule.

Question 13

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

Accepted Answer

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

Question 14

Which of the following is an example of feedback inhibition in cellular respiration?

Accepted Answer

ATP inhibits phosphofructokinase, slowing glycolysis when ATP levels are high.

Question 15

Which of the following organisms can survive using either fermentation or cellular respiration depending on oxygen availability?

Accepted Answer

Facultative anaerobes

Question 16

During oxidative phosphorylation, what is the role of ATP synthase?

Accepted Answer

It catalyzes the phosphorylation of ADP to ATP using the energy from the proton gradient.

Question 17

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis occurs in the cytoplasm and does not require oxygen.

Question 18

A cell is exposed to a toxin that blocks the function of cytochromes in the electron transport chain. What is the most immediate consequence?

Accepted Answer

ATP production by oxidative phosphorylation decreases.

Question 19

Which of the following is true regarding the evolutionary significance of glycolysis?

Accepted Answer

Glycolysis is the most widespread metabolic pathway and functions in both fermentation and cellular respiration.

Question 20

Which of the following best describes the flow of energy during cellular respiration?

Accepted Answer

Glucose $$\rightarrow$$ NADH $$\rightarrow$$ electron transport chain $$\rightarrow$$ proton-motive force $$\rightarrow$$ ATP

Cellular Respiration and Fermentation: Mechanisms of Energy Harvest in Cells

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