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

Question 1

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

Accepted Answer

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

Question 2

During glycolysis, what is the net gain of ATP and NADH molecules per molecule of glucose?

Accepted Answer

2 ATP, 2 NADH

Question 3

Which enzyme is primarily responsible for regulating the rate of glycolysis and how does it function?

Accepted Answer

Phosphofructokinase; by allosteric regulation in response to cellular energy needs

Question 4

Where in the cell does pyruvate oxidation occur, and what are the main products per pyruvate molecule?

Accepted Answer

Mitochondrial matrix; 1 Acetyl-CoA, 1 NADH, 1 CO2

Question 5

Which of the following statements about glycolysis is FALSE?

Accepted Answer

Glycolysis requires oxygen to proceed.

Question 6

What is the primary role of NAD+ in cellular respiration?

Accepted Answer

To serve as an electron carrier, accepting electrons and becoming reduced to NADH

Question 7

Which of the following best explains why glycolysis is considered an anaerobic process?

Accepted Answer

It does not require oxygen to proceed.

Question 8

During the citric acid cycle, what happens to the two carbons from acetyl-CoA?

Accepted Answer

They are released as two molecules of CO2.

Question 9

Which of the following is a correct summary of the products generated from one glucose molecule after two turns of the citric acid cycle?

Accepted Answer

2 ATP, 6 NADH, 2 FADH2, 4 CO2

Question 10

Which process in cellular respiration directly produces the most ATP?

Accepted Answer

Oxidative phosphorylation

Question 11

A patient has a genetic defect that prevents the formation of NADH during glycolysis. Which of the following would most likely occur?

Accepted Answer

The patient would have reduced ATP production during oxidative phosphorylation.

Question 12

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

Direct transfer of a phosphate group from a substrate to ADP to form ATP

Question 13

Which molecule is regenerated at the end of the citric acid cycle, allowing the cycle to continue?

Accepted Answer

Oxaloacetate

Question 14

Which of the following is NOT a product of pyruvate oxidation?

Accepted Answer

ATP

Question 15

If a cell is unable to regulate phosphofructokinase, what is the most likely consequence?

Accepted Answer

The rate of glycolysis will not adjust to the cell's energy needs.

Question 16

Which of the following best explains why animals can harvest energy from proteins, carbohydrates, and lipids?

Accepted Answer

They can all be converted into intermediates that enter cellular respiration pathways.

Question 17

Which of the following is an example of an oxidation-reduction (redox) reaction in cellular respiration?

Accepted Answer

NAD+ gains electrons to become NADH.

Question 18

A scientist isolates mitochondria and provides them with pyruvate, NAD+, and coenzyme A, but no oxygen. Which of the following will occur?

Accepted Answer

Pyruvate will be converted to acetyl-CoA, NADH, and CO2.

Question 19

Which of the following best describes the fate of the electrons carried by NADH and FADH2 generated during glycolysis and the citric acid cycle?

Accepted Answer

They are used to reduce oxygen to water during oxidative phosphorylation.

Cellular Respiration: Glycolysis, Pyruvate Oxidation, and the Citric Acid Cycle

Study Guide - Practice Questions