Q: Which of the following is a correct summary equation for aerobic cellular respiration?

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

Question 1

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

Accepted Answer

To break down glucose and other molecules to produce ATP, the cell’s main energy currency.

Question 2

During glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

$$2$$

Question 3

What is the main 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 and ATP synthase.

Question 4

Which of the following equations correctly represents the reduction of NAD+ during cellular respiration?

Accepted Answer

$$\mathrm{NAD^+} + 2e^- + 2H^+ \rightarrow \mathrm{NADH} + H^+$$

Question 5

In the citric acid cycle, which molecule is regenerated at the end of each cycle to combine with acetyl-CoA and start the cycle again?

Accepted Answer

Oxaloacetate

Question 6

Which of the following best explains why fermentation is necessary in the absence of oxygen?

Accepted Answer

Fermentation allows glycolysis to continue by regenerating NAD+ from NADH.

Question 7

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

Accepted Answer

Lactate

Question 8

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

Accepted Answer

To drive the synthesis of ATP by ATP synthase.

Question 9

Which of the following statements about the location of cellular respiration steps is correct?

Accepted Answer

Glycolysis occurs in the cytoplasm, while the citric acid cycle and electron transport chain occur in the mitochondria.

Question 10

A patient’s muscle cells are deprived of oxygen during intense exercise. Which process will their cells rely on to produce ATP, and what is a likely byproduct?

Accepted Answer

Fermentation; lactate

Question 11

Which of the following best describes the fate of the carbon atoms from glucose during aerobic cellular respiration?

Accepted Answer

They are released as carbon dioxide ($$CO_2).$$

Question 12

Which of the following is true regarding the energy yield of fermentation compared to aerobic respiration?

Accepted Answer

Fermentation produces less ATP per glucose molecule than aerobic respiration.

Question 13

Which of the following best explains why the electron transport chain is considered a series of redox reactions?

Accepted Answer

Electrons are transferred from one molecule to another, with each transfer involving oxidation and reduction.

Question 14

Which of the following is a correct summary equation for aerobic cellular respiration?

Accepted Answer

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

Question 15

If a poison blocks the function of ATP synthase, which process will be directly affected?

Accepted Answer

ATP production via oxidative phosphorylation

Question 16

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

Accepted Answer

FAD is reduced to FADH2, which then donates electrons to the electron transport chain.

Question 17

Which of the following is a key difference between lactic acid fermentation and alcoholic fermentation?

Accepted Answer

Lactic acid fermentation occurs in muscle cells, while alcoholic fermentation occurs in yeast.

Question 18

A scientist is studying a cell that can survive in both aerobic and anaerobic conditions. When oxygen is present, which pathway will the cell primarily use to maximize ATP production?

Accepted Answer

Aerobic cellular respiration

Question 19

Which of the following best explains why the inner mitochondrial membrane is essential for ATP production during oxidative phosphorylation?

Accepted Answer

It houses the electron transport chain and ATP synthase, enabling the formation of a proton gradient.

Cellular Respiration: Mechanisms and Pathways

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