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

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

Question 1

During the intermediate step between glycolysis and the citric acid cycle, what are the products formed from the oxidation of one molecule of pyruvate?

Accepted Answer

Acetyl CoA, CO2, and NADH

Question 2

Which of the following best describes the main function of the citric acid cycle in cellular respiration?

Accepted Answer

To complete the oxidation of organic molecules and generate electron carriers

Question 3

For each glucose molecule, how many NADH molecules are produced by the citric acid cycle?

Accepted Answer

$$6$$

Question 4

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

Accepted Answer

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

Question 5

What is the primary role of oxygen in cellular respiration?

Accepted Answer

It acts as the final electron acceptor in the electron transport chain.

Question 6

Which of the following best explains why metabolic poisons like cyanide are deadly to cells?

Accepted Answer

They block the electron transport chain, preventing ATP synthesis.

Question 7

If a poison such as DNP allows protons to leak across the inner mitochondrial membrane, what is the most likely consequence?

Accepted Answer

ATP synthesis by ATP synthase will decrease.

Question 8

Which process produces the most ATP per molecule of glucose during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 9

What would happen to the pH of the intermembrane space as protons (H+) are pumped into it during electron transport?

Accepted Answer

The pH would decrease (become more acidic).

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 exposed to carbon monoxide, which blocks the final step of the electron transport chain. What is the immediate effect on cellular respiration?

Accepted Answer

Electron flow stops, and ATP production by oxidative phosphorylation ceases.

Question 12

Which of the following best describes the role of ATP synthase in the mitochondrion?

Accepted Answer

It uses the energy of the proton gradient to synthesize ATP from ADP and $$P_i.$$

Question 13

Which electron carrier contributes more to the proton gradient in the electron transport chain?

Accepted Answer

NADH

Question 14

What is the main reason that oxidative phosphorylation could not occur without glycolysis and the citric acid cycle?

Accepted Answer

These two stages supply the electrons needed for the electron transport chain.

Question 15

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

A phosphate group is directly transferred from a substrate to ADP to form ATP.

Question 16

Which of the following best describes the fate of most of the energy remaining from glucose at the end of the citric acid cycle?

Accepted Answer

It is stored in NADH.

Question 17

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

Electrons are lost from one substance and added to another substance.

Question 18

In fermentation, which molecule is oxidized to regenerate NAD+?

Accepted Answer

NADH

Question 19

Which of the following best explains why facultative anaerobes switch to fermentation in the absence of oxygen?

Accepted Answer

The electron transport chain cannot operate without oxygen as the final electron acceptor.

Question 20

Which of the following organic molecules can be used as fuel for cellular respiration?

Accepted Answer

Carbohydrates, fats, and proteins

Ch.6 Cellular Respiration Pt.2 : Intermediate Step, Citric Acid Cycle, & Oxidative Phosphorylation

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