Q: Which of the following equations correctly represents the overall process of aerobic cellular respiration?

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

Question 1

Which of the following best describes the difference between catabolism and anabolism in cellular metabolism?

Accepted Answer

Catabolism breaks down complex molecules to release energy, while anabolism builds complex molecules from simpler ones using energy.

Question 2

A patient is diagnosed with a genetic disorder that prevents the conversion of NAD$^+$ to NADH during glycolysis. Which of the following would most likely be affected?

Accepted Answer

The transfer of electrons to the electron transport chain, reducing ATP production.

Question 3

Which of the following equations correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

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

Question 4

Which statement best explains the role of ATP in cellular metabolism?

Accepted Answer

ATP stores energy in its phosphate bonds and releases it when converted to ADP.

Question 5

During aerobic respiration, what is the final electron acceptor in the electron transport chain?

Accepted Answer

O$_2$

Question 6

A scientist measures the activation energy ($E_a$) of a reaction with and without an enzyme. Which of the following best describes the effect of the enzyme?

Accepted Answer

The enzyme decreases $E_a$, increasing the reaction rate.

Question 7

Which of the following best distinguishes between aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration requires oxygen and produces more ATP, while fermentation occurs without oxygen and produces less ATP.

Question 8

Which of the following is a correct statement about the electron carriers NAD$^+$/NADH and FAD/FADH$_2$?

Accepted Answer

NAD$^+$ and FAD are reduced to NADH and FADH$_2$ by gaining electrons during cellular respiration.

Question 9

A patient is unable to produce sufficient ATP due to a defect in ATP synthase. Which process is most directly impaired?

Accepted Answer

Oxidative phosphorylation in the mitochondria

Question 10

Which of the following best describes the function of the active site of an enzyme?

Accepted Answer

It binds to the substrate and catalyzes the chemical reaction.

Question 11

Which of the following is an example of a real-life scenario involving the loss of free energy as heat, as described by the second law of thermodynamics?

Accepted Answer

A person shivering to maintain body temperature in a cold environment.

Question 12

Which step in aerobic respiration produces the most ATP?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 13

A person is exercising vigorously and their muscles begin to produce lactic acid. Which process is occurring and why?

Accepted Answer

Fermentation, because oxygen is limited and pyruvate is converted to lactic acid to regenerate NAD$^+$.

Question 14

Which of the following best explains why anaerobic respiration is not the same as fermentation?

Accepted Answer

Anaerobic respiration uses an electron transport chain with a final electron acceptor other than oxygen, while fermentation does not use an electron transport chain.

Question 15

Which of the following best describes the relationship between substrate and enzyme in enzyme regulation?

Accepted Answer

The substrate binds to the enzyme's active site, and the enzyme catalyzes its conversion to product.

Question 16

Which of the following is a correct statement about oxidative phosphorylation?

Accepted Answer

It occurs in the mitochondria and involves the transfer of electrons through the electron transport chain to generate ATP.

Question 17

A mutation causes a defect in the protein complex that transfers electrons from NADH to the electron transport chain. What is the most likely consequence?

Accepted Answer

Decreased ATP production due to impaired electron flow and proton gradient formation.

Question 18

Which of the following best explains why the citric acid cycle is considered a central metabolic pathway?

Accepted Answer

It oxidizes acetyl-CoA to CO$_2$ and generates NADH and FADH$_2$ for the electron transport chain.

Cellular Respiration, Energy, and Metabolism: Study Notes for Anatomy & Physiology

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