$$\text{C}_6\text{H}_{12}\text{O}_6 + 6 \text{O}_2 \rightarrow 6 \text{CO}_2 + 6 \text{H}_2\text{O} + \sim 38 \text{ATP}$$

Question 1

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

Accepted Answer

$$	ext{C}_6	ext{H}_{12}	ext{O}_6 + 6 	ext{O}_2 ightarrow 6 	ext{CO}_2 + 6 	ext{H}_2	ext{O} + \sim 38 	ext{ATP}$$

Question 2

Which organelle is primarily responsible for the aerobic steps of cellular respiration?

Accepted Answer

Mitochondrion

Question 3

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

Accepted Answer

Electron transport chain

Question 4

Which of the following best describes a redox reaction in cellular respiration?

Accepted Answer

A reaction where electrons are transferred from one molecule to another

Question 5

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

Accepted Answer

It acts as an electron carrier, becoming reduced to NADH

Question 6

Which process involves the direct transfer of a phosphate group from a substrate to ADP to form ATP?

Accepted Answer

Substrate-level phosphorylation

Question 7

Which of the following is an example of decarboxylation during cellular respiration?

Accepted Answer

Conversion of pyruvate to acetyl CoA with the release of CO$$_2$$

Question 8

Which statement about ATP is correct?

Accepted Answer

Breaking a phosphate bond in ATP releases energy for cellular work

Question 9

Which of the following best explains why the breakdown of glucose in cellular respiration is stepwise rather than a single reaction?

Accepted Answer

Stepwise breakdown allows energy to be captured efficiently in ATP rather than lost as heat

Question 10

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

Accepted Answer

O$$_2$$

Question 11

A patient’s cells are unable to produce FADH$$_2. $$Which stage of cellular respiration would be most directly affected?

Accepted Answer

Citric acid (Krebs) cycle

Question 12

Which enzyme is responsible for catalyzing the addition of a phosphate group to a molecule during phosphorylation?

Accepted Answer

Kinase

Question 13

Which of the following best describes the process of isomerization in glycolysis?

Accepted Answer

The rearrangement of glucose-6-phosphate to fructose-6-phosphate

Question 14

Which of the following is a correct description of the relationship between oxidation and reduction?

Accepted Answer

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

Question 15

Which molecule is produced during glycolysis and enters the mitochondria for further oxidation?

Accepted Answer

Pyruvate

Question 16

If a toxin inhibits ATP synthase, which process would be directly affected?

Accepted Answer

Oxidative phosphorylation

Question 17

Which of the following best explains why NADH and FADH$$_2$$ are considered 'temporary energy carriers'?

Accepted Answer

They store electrons and transfer them to the electron transport chain to generate ATP

Question 18

Which of the following is a real-life example of substrate-level phosphorylation?

Accepted Answer

ATP production during the conversion of phosphoenolpyruvate to pyruvate in glycolysis

Question 19

A mutation prevents the removal of phosphate groups from proteins in a cell. Which enzyme is most likely nonfunctional?

Accepted Answer

Phosphatase

Question 20

Which of the following best describes the fate of the electrons carried by NADH and FADH$$_2 in $$aerobic respiration?

Accepted Answer

They are transferred to oxygen in the electron transport chain, forming water

Cellular Respiration: Mechanisms of Energy Production in Cells

Study Guide - Practice Questions