Q: Which equation correctly represents the decarboxylation of pyruvate to acetyl CoA?

$$\text{Pyruvate} + \text{NAD}^+ + \text{CoA} \rightarrow \text{Acetyl CoA} + \text{NADH} + \text{CO}_2$$

Q: A researcher measures the ATP yield from one glucose molecule in a cell. Which equation best estimates the total ATP produced from aerobic respiration?

$$\text{Glycolysis} + \text{Krebs Cycle} + \text{Oxidative Phosphorylation} \approx 30-32$$

Question 1

Which of the following correctly lists the three major steps of the aerobic pathway in cellular respiration, in order?

Accepted Answer

Glycolysis, Krebs Cycle (Citric Acid Cycle), Oxidative Phosphorylation

Question 2

Where does the Krebs Cycle (Citric Acid Cycle) occur within a eukaryotic cell?

Accepted Answer

Mitochondrial matrix

Question 3

Before entering the Krebs Cycle, pyruvate is converted to acetyl CoA. Which of the following is a product of this conversion per glucose molecule?

Accepted Answer

2 NADH

Question 4

During the conversion of pyruvate to acetyl CoA, which molecule is released as a waste product?

Accepted Answer

CO$$_2$$

Question 5

In the Krebs Cycle, acetyl CoA combines with which molecule to form citrate?

Accepted Answer

Oxaloacetate

Question 6

For each glucose molecule, how many times does the Krebs Cycle turn?

Accepted Answer

Twice

Question 7

Which of the following is the correct formula for the net NADH produced by the Krebs Cycle per glucose molecule?

Accepted Answer

$$3 	imes 2 = 6$$

Question 8

Which process in aerobic respiration directly produces the most ATP?

Accepted Answer

Oxidative Phosphorylation

Question 9

A patient has a genetic defect that prevents the formation of oxaloacetate. Which step of cellular respiration would be directly affected?

Accepted Answer

Krebs Cycle

Question 10

Which molecule acts as the final electron acceptor in oxidative phosphorylation?

Accepted Answer

O$$_2$$

Question 11

If a toxin blocks the transport protein that moves pyruvate into the mitochondrion, which process would be directly inhibited?

Accepted Answer

Conversion of pyruvate to acetyl CoA

Question 12

Which of the following is produced by substrate-level phosphorylation in the Krebs Cycle per turn?

Accepted Answer

ATP (or GTP)

Question 13

How many molecules of CO$$_2$$ are released from the Krebs Cycle per glucose molecule?

Accepted Answer

4

Question 14

Which of the following best describes the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons during glycolysis and the Krebs Cycle.

Question 15

A mutation prevents the formation of FADH$$_2 in $$the Krebs Cycle. What is the most direct consequence for cellular respiration?

Accepted Answer

Reduced electron flow to the electron transport chain

Question 16

Which equation correctly represents the decarboxylation of pyruvate to acetyl CoA?

Accepted Answer

$$	ext{Pyruvate} + 	ext{NAD}^+ + 	ext{CoA} ightarrow 	ext{Acetyl CoA} + 	ext{NADH} + 	ext{CO}_2$$

Question 17

Which of the following is NOT a product of the Krebs Cycle per turn?

Accepted Answer

Glucose

Question 18

If a cell is deprived of oxygen, which step of aerobic respiration will be directly halted first?

Accepted Answer

Oxidative Phosphorylation

Question 19

Which molecule is regenerated at the end of the Krebs Cycle, allowing the cycle to continue?

Accepted Answer

Oxaloacetate

Question 20

A researcher measures the ATP yield from one glucose molecule in a cell. Which equation best estimates the total ATP produced from aerobic respiration?

Accepted Answer

$$	ext{Glycolysis} + 	ext{Krebs Cycle} + 	ext{Oxidative Phosphorylation} \approx 30-32$$

Aerobic Cellular Respiration: Major Steps and the Citric Acid (Krebs) Cycle

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