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

Question 1

Which of the following best describes the overall equation for cellular respiration?

Accepted Answer

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

Question 2

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Oxidative phosphorylation

Question 3

What is the primary role of oxygen in cellular respiration?

Accepted Answer

To act as the final electron acceptor in the electron transport chain

Question 4

Which process occurs in the cytosol and does not require oxygen?

Accepted Answer

Glycolysis

Question 5

If a cell is deprived of oxygen, which process will continue to function?

Accepted Answer

Glycolysis

Question 6

Which molecule is reduced during the process of cellular respiration?

Accepted Answer

Oxygen

Question 7

What is the net gain of ATP molecules produced directly by glycolysis from one molecule of glucose?

Accepted Answer

2

Question 8

Which of the following statements about fermentation is correct?

Accepted Answer

Fermentation regenerates NAD$$^+ so $$glycolysis can continue.

Question 9

In the citric acid cycle, what happens to the two-carbon group of acetyl CoA?

Accepted Answer

It is joined to a four-carbon compound to form citrate.

Question 10

Which of the following best explains why fats are considered excellent cellular fuels?

Accepted Answer

They contain many hydrogen atoms and energy-rich electrons.

Question 11

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

Accepted Answer

To accept electrons and become reduced to NADH

Question 12

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 13

A person is running and their muscle cells are carrying out cellular respiration. Which of the following is true?

Accepted Answer

Oxygen is consumed and carbon dioxide is produced.

Question 14

Which of the following is a product of lactic acid fermentation in human muscle cells?

Accepted Answer

Lactate

Question 15

Why is the total number of ATP molecules produced per glucose molecule in cellular respiration not always exactly 32?

Accepted Answer

Some energy is lost as heat and some NADH transfers electrons to FAD, which produces less ATP.

Question 16

Which of the following best describes the role of the electron transport chain in cellular respiration?

Accepted Answer

It pumps hydrogen ions to create a gradient used for ATP synthesis.

Question 17

A person is exposed to a cold environment and their brown fat becomes more active. What is the likely result?

Accepted Answer

Increased heat production without making ATP

Question 18

Which of the following is an example of feedback inhibition in metabolic pathways?

Accepted Answer

A product of a pathway accumulates and suppresses the process that produces it.

Question 19

Which of the following statements about facultative anaerobes is correct?

Accepted Answer

They can make ATP by fermentation or oxidative phosphorylation.

Question 20

During which phase of glycolysis is ATP consumed?

Accepted Answer

Energy investment phase (steps 1-4)

Chapter 6: How Cells Harvest Chemical Energy – Cellular Respiration and Metabolic Pathways

Study Guide - Practice Questions