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

Question 1

Which of the following best describes the process of fermentation?

Accepted Answer

A partial degradation of sugars or other organic fuel that occurs without the use of oxygen.

Question 2

During aerobic respiration, what is the overall chemical equation for the breakdown of glucose?

Accepted Answer

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

Question 3

Which statement about redox reactions in cellular respiration is correct?

Accepted Answer

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

Question 4

In the generalized redox reaction $$\mathrm{Xe^- + Y \rightarrow X + Ye^-}$$, which component is oxidized and which is reduced?

Accepted Answer

Xe$$^- is $$oxidized; Y is reduced.

Question 5

What is the role of NAD$$^+ in $$cellular respiration?

Accepted Answer

It serves as an electron carrier, accepting electrons and a proton to become NADH.

Question 6

Which molecule is the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

Oxygen ($$\mathrm{O_2$})$$

Question 7

What is the main function of the electron transport chain in cellular respiration?

Accepted Answer

To break the fall of electrons to oxygen in several energy-releasing steps.

Question 8

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

Accepted Answer

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

Question 9

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

Accepted Answer

2 ATP

Question 10

Which of the following best explains why the breakdown of glucose in cellular respiration is exergonic?

Accepted Answer

It has a negative $$\Delta G$$ and releases energy.

Question 11

Which statement correctly describes the difference between NAD$$^+$$ and NADH?

Accepted Answer

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

Question 12

Which of the following is NOT a function of coenzymes in cellular respiration?

Accepted Answer

Serving as the final electron acceptor in the electron transport chain.

Question 13

In the electron transport chain, where are the carrier molecules located in eukaryotic cells?

Accepted Answer

The inner membrane of the mitochondria

Question 14

Which process in cellular respiration produces the most ATP?

Accepted Answer

Oxidative phosphorylation (electron transport and chemiosmosis)

Question 15

If a cell is deprived of oxygen, which process will be directly affected first?

Accepted Answer

Electron transport chain

Question 16

Which of the following is a correct description of the fate of electrons from glucose during aerobic respiration?

Accepted Answer

Electrons are transferred from glucose to NAD$$^+$$, then through the electron transport chain to oxygen.

Question 17

Which of the following best explains why oxygen is required for aerobic respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing the chain to function and ATP to be produced.

Question 18

Which of the following is a product of the citric acid cycle?

Accepted Answer

NADH

Question 19

A patient is unable to produce sufficient NAD$$^+ in $$their cells. Which process would be most directly affected?

Accepted Answer

Glycolysis, because NAD$$^+ is $$required to accept electrons during the oxidation of glucose.

Question 20

Which of the following best describes the energy transformation during cellular respiration?

Accepted Answer

Chemical energy in glucose is converted to ATP and some is lost as heat.

Cellular Respiration and Fermentation: Key Concepts and Pathways

Study Guide - Practice Questions