$ \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 aerobic cellular respiration?

Accepted Answer

Oxygen acts as the final electron acceptor in the electron transport chain, allowing electrons to 'fall' and energy to be released for ATP synthesis.

Question 2

During photosynthesis, which of the following is the primary product and which is the waste product?

Accepted Answer

Glucose is the primary product; oxygen is the waste product.

Question 3

Which equation correctly represents the overall process of aerobic 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 4

Which of the following statements best explains the relationship between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose molecules, while cellular respiration releases that energy for cellular work.

Question 5

Which type of organism performs both photosynthesis and cellular respiration?

Accepted Answer

Autotrophs such as plants and algae.

Question 6

How is breathing directly related to cellular respiration in humans?

Accepted Answer

Breathing supplies oxygen needed for cellular respiration and removes carbon dioxide produced as a waste product.

Question 7

Approximately how many molecules of ATP are produced from one molecule of glucose during aerobic cellular respiration?

Accepted Answer

About 32 molecules of ATP.

Question 8

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

Accepted Answer

Glucose is oxidized; NAD+ is reduced to NADH.

Question 9

Why is oxygen referred to as an 'electron grabber' in cellular respiration?

Accepted Answer

Oxygen has a high affinity for electrons and pulls them down the electron transport chain, allowing energy to be released.

Question 10

What important event occurs as electrons 'fall' down the electron transport chain?

Accepted Answer

Energy is released and used to pump protons, creating a gradient that drives ATP synthesis via ATP synthase.

Question 11

Which of the following is a correct description of a redox reaction in cellular respiration?

Accepted Answer

A redox reaction involves the transfer of electrons, where one molecule is oxidized and another is reduced.

Question 12

Which metabolic pathway is responsible for the initial breakdown of glucose in cellular respiration?

Accepted Answer

Glycolysis

Question 13

What is the role of NADH and FADH$_2$ in cellular respiration?

Accepted Answer

They carry electrons to the electron transport chain for ATP production.

Question 14

Which of the following best describes fermentation?

Accepted Answer

Fermentation is an anaerobic process that allows glycolysis to continue by regenerating NAD+.

Question 15

Which molecule is produced during lactic acid fermentation in muscle cells?

Accepted Answer

Lactic acid

Question 16

Which enzyme is responsible for synthesizing ATP during oxidative phosphorylation?

Accepted Answer

ATP synthase

Question 17

Which of the following is a waste product of aerobic cellular respiration?

Accepted Answer

Carbon dioxide ($\mathrm{CO_2}$)

Question 18

What is the function of Coenzyme A in cellular respiration?

Accepted Answer

It carries acetic acid into the citric acid cycle as Acetyl CoA.

Question 19

Which of the following best describes slow-twitch muscle fibers?

Accepted Answer

They are adapted for endurance and rely primarily on aerobic respiration.

Question 20

Which of the following is a correct definition of an autotroph?

Accepted Answer

An organism that produces its own food using energy from sunlight or inorganic chemicals.

Cellular Respiration and Energy Acquisition: Study Guide Notes

Study Guide - Practice Questions