Q: Which of the following equations correctly represents the net ATP yield from one molecule of glucose during glycolysis?

$$ \text{Glucose} + 2 \text{ADP} + 2 \text{Pi} \rightarrow 2 \text{Pyruvate} + 2 \text{ATP} + 2 \text{NADH} $$

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

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

Q: Which of the following is the correct formula for the conversion of pyruvate to lactate during anaerobic respiration?

$$ \text{Pyruvate} + \text{NADH} \rightarrow \text{Lactate} + \text{NAD}^+ $$

Question 1

Which of the following best describes the role of enzymes in metabolic pathways such as glycolysis?

Accepted Answer

Enzymes lower the activation energy, allowing reactions to proceed more rapidly.

Question 2

During glycolysis, glucose is converted into which molecule before entering the Krebs cycle?

Accepted Answer

Pyruvate

Question 3

Which of the following equations correctly represents the net ATP yield from one molecule of glucose during glycolysis?

Accepted Answer

$$ 	ext{Glucose} + 2 	ext{ADP} + 2 	ext{Pi} ightarrow 2 	ext{Pyruvate} + 2 	ext{ATP} + 2 	ext{NADH} $$

Question 4

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is most likely being utilized to produce ATP under these anaerobic conditions?

Accepted Answer

Glycolysis followed by lactic acid fermentation

Question 5

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

Accepted Answer

Oxygen

Question 6

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

Accepted Answer

Electron transport chain

Question 7

Which of the following best explains why NAD+ is essential for glycolysis to continue?

Accepted Answer

NAD+ accepts electrons during glycolysis, allowing the pathway to proceed.

Question 8

Which of the following is a correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis → Krebs cycle → Electron transport chain

Question 9

A mutation causes a deficiency in the enzyme pyruvate dehydrogenase. Which metabolic process will be directly affected?

Accepted Answer

Conversion of pyruvate to acetyl-CoA

Question 10

Which of the following equations represents the overall reaction for aerobic 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 11

Which of the following statements about ATP is correct?

Accepted Answer

ATP contains three phosphate groups and is the primary energy currency of the cell.

Question 12

A patient with a genetic disorder cannot efficiently convert glucose to pyruvate. Which pathway is most likely impaired?

Accepted Answer

Glycolysis

Question 13

Which of the following is a product of the Krebs cycle that is used in the electron transport chain?

Accepted Answer

NADH

Question 14

If a cell is exposed to cyanide, which part of cellular respiration is directly inhibited?

Accepted Answer

Electron transport chain

Question 15

Which of the following best explains why lactic acid builds up in muscles during intense exercise?

Accepted Answer

Oxygen is unavailable, so pyruvate is converted to lactic acid to regenerate NAD+.

Question 16

Which of the following is the correct formula for the conversion of pyruvate to lactate during anaerobic respiration?

Accepted Answer

$$ 	ext{Pyruvate} + 	ext{NADH} ightarrow 	ext{Lactate} + 	ext{NAD}^+ $$

Question 17

Which of the following is NOT a product of glycolysis?

Accepted Answer

CO2

Question 18

A patient is unable to produce sufficient ATP in their cells. Which organelle is most likely malfunctioning?

Accepted Answer

Mitochondria

Question 19

Which of the following best describes the function of coenzymes such as NAD+ and FAD in cellular respiration?

Accepted Answer

They accept and transfer electrons during metabolic reactions.

Question 20

Which of the following is the correct formula for the phosphorylation of ADP to ATP?

Accepted Answer

$$ 	ext{ADP} + 	ext{Pi} ightarrow 	ext{ATP} $$

Overview of Enzyme Kinetics and Inhibition

Study Guide - Practice Questions

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