$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{H_2O} + 6\ \mathrm{CO_2$} + 38\ \mathrm{ATP} + \text{heat}$$

Question 1

Which of the following best describes the process of catabolism in human cells?

Accepted Answer

The breakdown of complex molecules into simpler ones, releasing energy.

Question 2

During glycolysis, which of the following is the net ATP yield per molecule of glucose?

Accepted Answer

$$2 	ext{ ATP}$$

Question 3

Which nutrient monomer is primarily used for energy during the initial stages of aerobic glucose catabolism?

Accepted Answer

Monosaccharides

Question 4

A patient is experiencing muscle fatigue due to intense exercise and lack of oxygen. Which process is most likely occurring in their muscle cells?

Accepted Answer

Pyruvate is converted to lactate, regenerating NAD+ for glycolysis.

Question 5

Which of the following statements about ATP hydrolysis is correct?

Accepted Answer

ATP hydrolysis releases energy due to the repulsion between phosphate groups.

Question 6

In the electron transport chain, what is the primary role of oxygen?

Accepted Answer

To serve as the final electron acceptor, forming water.

Question 7

Which electron carrier is found in both the cytosol and mitochondrial matrix, and is reduced during glycolysis and the Citric Acid Cycle?

Accepted Answer

NAD+

Question 8

A scientist measures the ATP yield from the complete aerobic catabolism of one glucose molecule. Which equation correctly represents this process?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{H_2O} + 6\ \mathrm{CO_2$} + 38\ \mathrm{ATP} + 	ext{heat}$$

Question 9

Which process directly transfers a phosphate group from a substrate molecule to ADP, forming ATP without the need for oxygen?

Accepted Answer

Substrate-level phosphorylation

Question 10

During the Citric Acid Cycle, how many NADH molecules are produced per glucose molecule?

Accepted Answer

$$6\ 	ext{NADH}$$

Question 11

Which of the following best explains the coupling of exergonic and endergonic reactions in cells?

Accepted Answer

Cells use the energy released from exergonic reactions to drive endergonic reactions.

Question 12

A molecule undergoes oxidation during metabolism. Which of the following occurs?

Accepted Answer

The molecule loses electrons and often hydrogen atoms.

Question 13

If the electron transport chain is inhibited due to lack of oxygen, which of the following is most likely to occur?

Accepted Answer

The Citric Acid Cycle and ETC halt, and pyruvate is converted to lactate.

Question 14

Which of the following is the correct ATP yield from aerobic catabolism of one glucose molecule, including both direct and indirect ATP production?

Accepted Answer

$$38\ 	ext{ATP}$$

Question 15

Which stage of aerobic glucose catabolism produces the greatest number of ATP molecules?

Accepted Answer

Electron Transport Chain

Question 16

A biochemist is studying the electromotive force in mitochondria. Which statement best describes its role?

Accepted Answer

It is the energy difference that drives electrons through the electron transport chain.

Question 17

Which of the following is a correct summary of the Citric Acid Cycle per one glucose molecule?

Accepted Answer

2 ATP, 6 NADH, 2 FADH2, 4 CO2

Question 18

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

Accepted Answer

Oxidative phosphorylation in the electron transport chain

Question 19

If a cell is deprived of NAD+, which of the following processes would be directly affected first?

Accepted Answer

Glycolysis

Question 20

Which of the following best describes the fate of pyruvate under aerobic conditions?

Accepted Answer

It is converted to acetyl-CoA, releasing CO2 and producing NADH.

Metabolism and Nutrition: Study Guide for Aerobic Glucose Catabolism

Study Guide - Practice Questions