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

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

Question 1

Which of the following best describes the main goal of cellular respiration in eukaryotic cells?

Accepted Answer

To generate ATP from ADP and inorganic phosphate

Question 2

During glycolysis, glucose is broken down into which molecule, and what is the net ATP yield per glucose?

Accepted Answer

Two pyruvate; net yield of $$2$$ ATP

Question 3

Which stage of cellular respiration produces the majority of ATP, and what process is primarily responsible for this production?

Accepted Answer

Oxidative Phosphorylation; chemiosmosis via the electron transport chain

Question 4

In the electron transport chain, what is the final electron acceptor, and what is the chemical equation for its reduction?

Accepted Answer

O$$_2$$; $$\mathrm{O}_2 + 4e^- + 4H^+ \rightarrow 2\mathrm{H}_2\mathrm{O}$$

Question 5

Which of the following statements correctly compares aerobic respiration and fermentation?

Accepted Answer

Aerobic respiration produces more ATP per glucose than fermentation

Question 6

A patient is experiencing muscle fatigue during intense exercise. Which metabolic pathway is most likely being utilized, and what is the primary product?

Accepted Answer

Fermentation; lactic acid

Question 7

Which macromolecule can be broken down into glycerol and fatty acids, and how do its products enter cellular respiration?

Accepted Answer

Fats; glycerol enters glycolysis, fatty acids enter as acetyl-CoA in the citric acid cycle

Question 8

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

Accepted Answer

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

Question 9

Which of the following best explains why aerobic respiration yields more ATP than anaerobic fermentation?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, allowing complete oxidation of glucose

Question 10

A cell is deprived of oxygen but continues to produce ATP. Which process is occurring, and what is the net ATP yield per glucose?

Accepted Answer

Fermentation; $$2$$ ATP

Question 11

Which enzyme is responsible for synthesizing ATP from ADP and inorganic phosphate during oxidative phosphorylation?

Accepted Answer

ATP synthase

Question 12

Which of the following is a redox reaction occurring during cellular respiration?

Accepted Answer

Glucose is oxidized to CO$$_2$$ and oxygen is reduced to H$$_2O$$

Question 13

Which statement best describes the role of NAD$$^+$$ and FAD in cellular respiration?

Accepted Answer

They act as electron carriers, accepting electrons during redox reactions

Question 14

A facultative anaerobe is placed in an environment with no oxygen. Which metabolic pathway will it primarily use to generate ATP?

Accepted Answer

Fermentation

Question 15

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group to ADP from a phosphorylated intermediate

Question 16

During the citric acid cycle, acetyl-CoA is oxidized. What are the main products generated per cycle?

Accepted Answer

NADH, FADH$$_2$$, ATP (or GTP), CO$$_2$$

Question 17

Which pathway is shared by both aerobic respiration and fermentation?

Accepted Answer

Glycolysis

Question 18

A cell is using proteins as a fuel source for cellular respiration. Which process must occur before amino acids can enter the citric acid cycle?

Accepted Answer

Deamination to remove the amino group

Question 19

Which of the following is NOT a product of aerobic cellular respiration?

Accepted Answer

Lactic acid

Question 20

If a cell's electron transport chain is inhibited, which immediate effect would you expect?

Accepted Answer

Decrease in ATP production via oxidative phosphorylation

Cellular Respiration: Processes, Pathways, and Key Concepts

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