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

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

Question 1

Which of the following best describes the relationship between photosynthesis and cellular respiration in the context of energy flow in an ecosystem?

Accepted Answer

Photosynthesis converts light energy into chemical energy, which is then used by cellular respiration to produce ATP.

Question 2

Which equation correctly represents the overall process of 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 3

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 4

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

Accepted Answer

$$	ext{O}_2$$

Question 5

What is the main purpose of NAD+ in cellular respiration?

Accepted Answer

To function as an oxidizing agent, accepting electrons during redox reactions

Question 6

Which of the following statements about glycolysis is correct?

Accepted Answer

Glycolysis produces a net gain of 2 ATP per glucose molecule.

Question 7

In the absence of oxygen, which process allows cells to continue producing ATP?

Accepted Answer

Fermentation

Question 8

Which of the following best describes what happens to pyruvate in the presence of oxygen?

Accepted Answer

It is converted to acetyl CoA and enters the citric acid cycle.

Question 9

Which of the following is a correct description of a redox reaction?

Accepted Answer

Oxidation is the loss of electrons, and reduction is the gain of electrons.

Question 10

Why does the oxidation of fats yield more ATP than the oxidation of carbohydrates?

Accepted Answer

Fats have more electrons per carbon, leading to more NADH and FADH2 production.

Question 11

Which process is responsible for the regeneration of NAD+ during lactic acid fermentation?

Accepted Answer

The reduction of pyruvate to lactate

Question 12

A patient is diagnosed with a mitochondrial disorder that impairs the function of the electron transport chain. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Accumulation of NADH and FADH2

Question 13

Which of the following steps in cellular respiration produces CO2 as a waste product?

Accepted Answer

Citric acid cycle

Question 14

What is the role of the proton-motive force in mitochondria?

Accepted Answer

To drive the synthesis of ATP by ATP synthase

Question 15

Which of the following best explains why human muscle cells use lactic acid fermentation during intense exercise?

Accepted Answer

Oxygen is scarce, so cells regenerate NAD+ to continue glycolysis.

Question 16

Which of the following is a direct product of the citric acid cycle for each acetyl CoA that enters?

Accepted Answer

1 ATP, 3 NADH, 1 FADH2

Question 17

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

Accepted Answer

It directly transfers a phosphate group to ADP from a substrate molecule.

Question 18

A person is fasting and their body begins to break down stored fats for energy. Which molecule is produced from fatty acids and enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 19

Which of the following best explains why the electron transport chain is organized into a series of protein complexes?

Accepted Answer

To break the large free-energy drop from food to O2 into smaller, manageable steps

Question 20

Which of the following statements about the versatility of catabolism is correct?

Accepted Answer

Proteins, fats, and carbohydrates can all be funneled into cellular respiration at different points.

Cellular Respiration: Pathways for Energy Harvesting

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