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

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

Question 1

Which of the following best describes the main difference between cellular respiration and photosynthesis?

Accepted Answer

Cellular respiration releases energy by breaking down glucose, while photosynthesis stores energy by synthesizing glucose.

Question 2

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

Accepted Answer

$$2$$

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain (ETC) during aerobic cellular respiration?

Accepted Answer

O$$_2$$

Question 4

What is the primary purpose of the citric acid cycle in cellular respiration?

Accepted Answer

To generate electron carriers NADH and FADH$$_2$$ for the ETC

Question 5

Which of the following best explains how ATP is synthesized during oxidative phosphorylation?

Accepted Answer

ATP is synthesized as protons flow through ATP synthase down their electrochemical gradient.

Question 6

Which of the following processes occurs in the cytoplasm of eukaryotic cells?

Accepted Answer

Glycolysis

Question 7

During pyruvate oxidation, which of the following is produced per pyruvate molecule?

Accepted Answer

0 ATP, 1 NADH, 1 CO$$_2$$

Question 8

Which of the following best describes the role of NADH and FADH$$_2 in $$cellular respiration?

Accepted Answer

They are electron carriers that donate electrons to the electron transport chain.

Question 9

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

Accepted Answer

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

Question 10

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD+ so glycolysis can continue in the absence of oxygen.

Question 11

A patient is unable to produce sufficient ATP due to a defect in the electron transport chain. Which of the following is the most likely direct consequence?

Accepted Answer

Accumulation of NADH and FADH$$_2$$

Question 12

Which of the following best explains why fats yield more ATP per gram than carbohydrates?

Accepted Answer

Fats have more carbon-hydrogen bonds, providing more electrons for the electron transport chain.

Question 13

Which of the following is a key difference between substrate-level phosphorylation and oxidative phosphorylation?

Accepted Answer

Substrate-level phosphorylation directly transfers a phosphate group to ADP, while oxidative phosphorylation uses a proton gradient to drive ATP synthesis.

Question 14

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

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 15

Which of the following best describes the role of oxygen in cellular respiration?

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain, forming water.

Question 16

If a cell is deprived of oxygen, which process will continue to function?

Accepted Answer

Glycolysis

Question 17

Which of the following is a product of lactic acid fermentation?

Accepted Answer

Lactate

Question 18

Which of the following best explains why we breathe oxygen?

Accepted Answer

Oxygen is needed to accept electrons at the end of the electron transport chain, allowing ATP production.

Question 19

Which of the following statements about the feedback regulation of cellular respiration is correct?

Accepted Answer

High levels of ATP inhibit key enzymes in glycolysis and the citric acid cycle.

Question 20

A mutation prevents the formation of acetyl-CoA from pyruvate. Which process would be directly affected?

Accepted Answer

Citric acid cycle

Cellular Respiration: Processes, Mechanisms, and Comparisons

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