Q: Which equation correctly represents the net ATP, NADH, and FADH$$_2$$ production from one turn of the citric acid cycle?

$$1 \text{ ATP} + 3 \text{ NADH} + 1 \text{ FADH}_2$$

Question 1

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

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing the formation of water.

Question 2

During the formation of acetyl CoA from pyruvate, which of the following occurs?

Accepted Answer

Pyruvate is decarboxylated, producing CO$$_2$$ and NADH.

Question 3

Which equation correctly represents the net ATP, NADH, and FADH$$_2$$ production from one turn of the citric acid cycle?

Accepted Answer

$$1 	ext{ ATP} + 3 	ext{ NADH} + 1 	ext{ FADH}_2$$

Question 4

If a cell metabolizes one molecule of glucose through glycolysis, formation of acetyl CoA, and the citric acid cycle, how many NADH molecules are produced in total?

Accepted Answer

$$10$$

Question 5

Which of the following complexes in the electron transport chain directly transfers electrons to oxygen?

Accepted Answer

Complex IV (cytochrome c oxidase)

Question 6

What is the main consequence if the electron transport chain is inhibited at Complex III?

Accepted Answer

Electrons cannot be transferred from ubiquinone to cytochrome c, halting ATP production.

Question 7

Which process is responsible for the majority of ATP production during aerobic respiration?

Accepted Answer

Oxidative phosphorylation via ATP synthase

Question 8

A mutation causes the ATP synthase F$$_0$$ subunit to malfunction. What is the most likely effect on cellular respiration?

Accepted Answer

ATP production via oxidative phosphorylation will be severely reduced.

Question 9

Which of the following best explains why fatty acids yield more ATP per molecule than glucose during aerobic respiration?

Accepted Answer

Fatty acids have more carbon-hydrogen bonds, leading to more NADH and FADH$$_2$$ production during their breakdown.

Question 10

Which of the following is a direct product of the electron transport chain that is essential for oxidative phosphorylation?

Accepted Answer

An electrochemical proton gradient across the inner mitochondrial membrane

Question 11

If a poison blocks the movement of protons through ATP synthase, which of the following will occur?

Accepted Answer

ATP synthesis in the mitochondria will stop, but the electron transport chain may continue.

Question 12

Which of the following equations correctly represents the overall reaction for aerobic respiration of one glucose molecule?

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6	ext{O}_2 ightarrow 6	ext{CO}_2 + 6	ext{H}_2	ext{O} + 	ext{energy (ATP)}$$

Question 13

Which step in aerobic respiration produces the most NADH per glucose molecule?

Accepted Answer

Citric acid cycle

Question 14

A patient is diagnosed with a deficiency in Complex I of the electron transport chain. Which molecule's oxidation will be most directly affected?

Accepted Answer

NADH

Question 15

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

Accepted Answer

It completes the oxidation of acetyl CoA, producing CO$$_2$$, NADH, FADH$$_2$$, and ATP.

Question 16

Which of the following best explains why the electron transport chain is located in the inner mitochondrial membrane?

Accepted Answer

The inner membrane allows for the creation of a proton gradient necessary for ATP synthesis.

Question 17

Which of the following is true regarding the movement of protons in the electron transport chain?

Accepted Answer

Protons are pumped from the mitochondrial matrix to the intermembrane space, creating an electrochemical gradient.

Question 18

If a cell is deprived of oxygen, which process will be directly affected first?

Accepted Answer

Electron transport chain

Question 19

Which of the following is a function of the F$$_1$$ subunit of ATP synthase?

Accepted Answer

It catalyzes the phosphorylation of ADP to ATP.

Question 20

A researcher measures the ATP yield from one glucose molecule in a eukaryotic cell and finds it lower than expected. Which of the following could explain this observation?

Accepted Answer

Some protons leak across the inner mitochondrial membrane, reducing the efficiency of ATP synthase.

Aerobic Respiration: Chemotropic Energy Metabolism (Chapter 10) Study Notes

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