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

Question 1

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

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing the formation of water.

Question 2

During glycolysis, which molecule is oxidized and which is reduced?

Accepted Answer

Glucose is oxidized and NAD+ is reduced.

Question 3

What is the main goal of cellular respiration?

Accepted Answer

To convert the chemical energy of covalent bonds in food (glucose) into units of ATP.

Question 4

Which of the following equations correctly represents the general formula for 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

Which statement about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group from a substrate to ADP by an enzyme.

Question 6

In the electron transport chain (ETC), what is the consequence of electron transfer between complexes?

Accepted Answer

Protein complexes pump protons (H$$^+) $$into the intermembrane space, creating a proton gradient.

Question 7

Which of the following is TRUE regarding NAD$$^+$$ and NADH in cellular respiration?

Accepted Answer

NAD$$^+ is $$the oxidized form, and NADH is the reduced form.

Question 8

During the Krebs cycle, what is the fate of the acetyl group from acetyl CoA?

Accepted Answer

It is broken down into two molecules of CO$$_2.$$

Question 9

Which process produces the most ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation via the electron transport chain.

Question 10

If the oxidation of pyruvate were inhibited, which of the following would most likely occur?

Accepted Answer

Acetyl CoA would not accumulate, and the Krebs cycle would be halted.

Question 11

Which of the following best describes chemiosmosis?

Accepted Answer

The movement of H$$^+$$ ions down their concentration gradient through ATP synthase, resulting in ATP production.

Question 12

Which enzyme class is responsible for transferring phosphate groups between molecules?

Accepted Answer

Kinases.

Question 13

Which of the following is a correct net input and output for glycolysis?

Accepted Answer

Input: glucose, Output: 2 pyruvate, 2 ATP, 2 NADH

Question 14

Which statement about the movement of electrons in the electron transport chain is correct?

Accepted Answer

Electrons move from NADH and FADH$$_2 to $$oxygen, which is reduced to water.

Question 15

Which of the following is NOT a product of the Krebs cycle per glucose molecule?

Accepted Answer

Glucose.

Question 16

What is the role of ATP synthase in cellular respiration?

Accepted Answer

It synthesizes ATP as H$$^+$$ ions flow through it down their concentration gradient.

Question 17

Which of the following statements about glycolysis is TRUE?

Accepted Answer

Glycolysis does not require oxygen to proceed.

Question 18

During cellular respiration, which molecule acts as the reducing agent in the oxidation of glucose?

Accepted Answer

Glucose.

Question 19

Which of the following best explains why water is produced during cellular respiration?

Accepted Answer

Oxygen accepts electrons and protons at the end of the electron transport chain, forming water.

Question 20

Which of the following steps in cellular respiration directly produces the most NADH per glucose molecule?

Accepted Answer

Krebs cycle.

Cellular Respiration: Oxidation-Reduction, Glycolysis, Krebs Cycle, and Oxidative Phosphorylation

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