$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + \text{Energy (ATP)}$$

Question 1

Which of the following best describes the main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and other molecules to regenerate ATP for cellular work

Question 2

Which molecule acts as the final electron acceptor in the electron transport chain during oxidative phosphorylation?

Accepted Answer

O$$_2$$

Question 3

What is the correct summary equation for cellular respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy (ATP)}$$

Question 4

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

Accepted Answer

Oxidative phosphorylation

Question 5

Which of the following statements about ATP is TRUE?

Accepted Answer

ATP hydrolysis releases energy that can be used for cellular work

Question 6

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

Accepted Answer

To transfer electrons during redox reactions

Question 7

Where does glycolysis occur within the cell?

Accepted Answer

Cytoplasm (cytosol)

Question 8

Which process is responsible for the complete oxidation of glucose to CO$$_2$$?

Accepted Answer

Citric acid (Krebs) cycle

Question 9

In the context of redox reactions during cellular respiration, which statement is correct?

Accepted Answer

Glucose is oxidized and O$$_2 is $$reduced

Question 10

A patient is unable to efficiently produce ATP in their mitochondria. Which stage of cellular respiration is most likely impaired?

Accepted Answer

Oxidative phosphorylation

Question 11

Which of the following best explains why energy flows through an ecosystem and is not recycled?

Accepted Answer

Energy is converted to heat and lost to the environment

Question 12

Which molecule is reduced during the process of cellular respiration?

Accepted Answer

O$$_2$$

Question 13

If a toxin inhibits the enzyme that converts NADH back to NAD$$^+$$, what would be the immediate effect on cellular respiration?

Accepted Answer

ATP production would decrease

Question 14

Which of the following is NOT a product of the citric acid (Krebs) cycle?

Accepted Answer

Pyruvate

Question 15

A marathon runner relies on cellular respiration for energy. Which stage provides the most ATP for muscle contraction during the race?

Accepted Answer

Oxidative phosphorylation

Question 16

Which of the following best describes the role of FADH$$_2 in $$cellular respiration?

Accepted Answer

It donates electrons to the electron transport chain

Question 17

Which of the following is a correct sequence of events in cellular respiration?

Accepted Answer

Glycolysis → Citric acid cycle → Oxidative phosphorylation

Question 18

Which of the following statements about the ATP:ADP ratio in cells is correct?

Accepted Answer

The ratio is typically 10:1

Question 19

Which of the following best explains why plants and animals both need mitochondria?

Accepted Answer

Mitochondria are the site of ATP production from organic molecules

Question 20

Which of the following is a direct result of the transfer of electrons from NADH and FADH$$_2 to $$the electron transport chain?

Accepted Answer

Generation of a proton gradient across the mitochondrial membrane

Cellular Respiration: Chemical Principles and Energy Flow

Study Guide - Practice Questions