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

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} \rightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + \text{energy}$$

Question 1

Which of the following best describes the main difference between aerobic respiration and fermentation in terms of energy yield and final electron acceptor?

Accepted Answer

Aerobic respiration yields more ATP and uses oxygen as the final electron acceptor.

Question 2

During glycolysis, which enzyme is responsible for the key regulatory step that commits glucose to the pathway, and what is the significance of this regulation?

Accepted Answer

Phosphofructokinase (PFK); it controls the rate of glycolysis in response to cellular energy needs.

Question 3

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

Accepted Answer

$$\mathrm{C_6H_{12}O_6$} + 6\mathrm{O_2$} ightarrow 6\mathrm{CO_2$} + 6\mathrm{H_2O} + 	ext{energy}$$

Question 4

A patient is diagnosed with a mitochondrial disorder that impairs the electron transport chain (ETC). Which of the following consequences is most likely to occur?

Accepted Answer

Increased production of lactic acid due to reliance on fermentation.

Question 5

Which process directly produces the most ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 6

In the citric acid cycle, which molecule is regenerated at the end of each cycle to allow the process to continue?

Accepted Answer

Oxaloacetate

Question 7

Which of the following best explains why NADH and FADH$$_2$$ are important in cellular respiration?

Accepted Answer

They donate electrons to the electron transport chain, driving ATP synthesis.

Question 8

A muscle cell is deprived of oxygen during intense exercise. Which metabolic pathway will be primarily used to generate ATP, and what is the byproduct?

Accepted Answer

Fermentation; lactic acid

Question 9

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It directly transfers a phosphate group from a substrate to ADP to form ATP.

Question 10

During the electron transport chain, what is the primary role of the proton gradient across the inner mitochondrial membrane?

Accepted Answer

To drive the synthesis of ATP via ATP synthase.

Question 11

Which of the following best describes the relationship between photosynthesis and cellular respiration in plants?

Accepted Answer

Photosynthesis produces glucose and oxygen, which are used in cellular respiration to generate ATP.

Question 12

If a cell's supply of NAD$$^+ is $$depleted, which process will be directly inhibited?

Accepted Answer

Glycolysis

Question 13

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

Accepted Answer

Glycolysis $$\rightarrow$$ Citric acid cycle $$\rightarrow$$ Electron transport chain

Question 14

A poison blocks ATP synthase in mitochondria. What immediate effect would this have on the cell?

Accepted Answer

The cell would be unable to produce ATP via oxidative phosphorylation.

Question 15

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

Accepted Answer

Oxygen

Question 16

In a metabolic pathway, if an intermediate accumulates due to an enzyme deficiency, which of the following is most likely to occur?

Accepted Answer

The pathway will be blocked at the step catalyzed by the deficient enzyme.

Question 17

Which of the following best explains why the yield of ATP from cellular respiration can vary?

Accepted Answer

The transport of electrons from NADH and FADH$$_2 to $$the electron transport chain can differ between tissues and conditions.

Question 18

Which of the following is NOT a product of the citric acid cycle?

Accepted Answer

Pyruvate

Question 19

A yeast cell is growing in an environment with no oxygen. Which pathway will it use to generate ATP, and what is the main byproduct?

Accepted Answer

Fermentation; ethanol

Question 20

Which of the following best describes the role of the mitochondrial inner membrane in cellular respiration?

Accepted Answer

It houses the electron transport chain and ATP synthase, facilitating ATP production.

Cellular Respiration and Metabolic Pathways: Study Guide

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