Question 1

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

Accepted Answer

Oxygen is the final electron acceptor in the electron transport chain.

Question 2

The breakdown of glucose during cellular respiration is described as exergonic. What is the value of $$\Delta G$$ for this process, and what does it indicate?

Accepted Answer

$$\Delta G = -686$$ kcal/mol, indicating energy is released.

Question 3

During redox reactions in cellular respiration, which statement is correct regarding oxidation and reduction?

Accepted Answer

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

Question 4

Which molecule acts as the electron carrier during glycolysis and the citric acid cycle, switching between oxidized and reduced forms?

Accepted Answer

NAD$$^+$$

Question 5

What is the correct sequence of the main stages of cellular respiration?

Accepted Answer

Glycolysis, Citric Acid Cycle, Oxidative Phosphorylation

Question 6

Why is it necessary for cellular respiration to break down glucose in a stepwise manner rather than in a single explosive step?

Accepted Answer

Stepwise breakdown allows for efficient energy harvest and prevents loss of energy as heat.

Question 7

Which of the following is TRUE about fermentation?

Accepted Answer

Fermentation consists of glycolysis plus reactions that regenerate NAD$$^+.$$

Question 8

In the electron transport chain, which complex accepts electrons from NADH?

Accepted Answer

Complex I

Question 9

Which process yields the greatest amount of ATP per glucose molecule?

Accepted Answer

Aerobic respiration

Question 10

What is the net yield of ATP and NADH from one molecule of glucose during glycolysis?

Accepted Answer

2 ATP and 2 NADH

Question 11

Which statement best explains why molecules with many hydrogens are good fuel sources for cellular respiration?

Accepted Answer

Electrons associated with hydrogen have high potential energy and can be released as they fall down an energy gradient toward oxygen.

Question 12

Which of the following statements about facultative anaerobes is correct?

Accepted Answer

Facultative anaerobes can switch between aerobic respiration and fermentation depending on oxygen availability.

Question 13

During the oxidation of pyruvate, what is the immediate product that enters the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 14

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

Accepted Answer

ATP is produced directly by transferring a phosphate group from a substrate to ADP.

Question 15

In the context of redox reactions, what is the role of the reducing agent?

Accepted Answer

It loses electrons and becomes oxidized.

Question 16

Which of the following is NOT a product of the complete aerobic breakdown of one molecule of glucose?

Accepted Answer

Oxygen ($$O_2)$$

Question 17

Why do prokaryotes sometimes use substances other than oxygen as the final electron acceptor in respiration?

Accepted Answer

Oxygen may not be available in their environment.

Question 18

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

Accepted Answer

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

Question 19

Which stage of cellular respiration produces the majority of ATP?

Accepted Answer

Oxidative Phosphorylation

Cellular Respiration & Fermentation: Study Notes for General Biology

Study Guide - Practice Questions

Study Guide - Flashcards