$$C_6H_{12}O_6$ + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2O + \text{energy}$$

$$C_6H_{12}O_6$ + 6 O_2$ \rightarrow 6 CO_2$ + 6 H_2O + 36-38 \text{ATP}$$

Question 1

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

Accepted Answer

$$C_6H_{12}O_6$ + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2O + 	ext{energy}$$

Question 2

During glycolysis, one molecule of glucose is converted into which of the following products?

Accepted Answer

Two molecules of pyruvate

Question 3

Which molecule acts as the final electron acceptor in the electron transport chain during aerobic cellular respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 4

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

Accepted Answer

2 ATP

Question 5

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

Accepted Answer

Glycolysis

Question 6

In cellular respiration, which molecule is oxidized and which is reduced?

Accepted Answer

Glucose is oxidized; oxygen is reduced

Question 7

Which of the following is a direct product of the Krebs cycle (citric acid cycle)?

Accepted Answer

NADH

Question 8

If oxygen is not present, what process will follow glycolysis in muscle cells?

Accepted Answer

Lactic acid fermentation

Question 9

Which of the following best explains why cellular respiration is considered a catabolic pathway?

Accepted Answer

It breaks down complex molecules into simpler ones, releasing energy

Question 10

How many NADH molecules are produced per glucose molecule during glycolysis?

Accepted Answer

2 NADH

Question 11

Which step in cellular respiration produces the most ATP?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 12

What is the role of NAD+ in cellular respiration?

Accepted Answer

It acts as an electron carrier, accepting electrons during redox reactions

Question 13

Which of the following is NOT a product of cellular respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 14

A patient is unable to efficiently use oxygen in their cells. Which stage of cellular respiration would be most directly affected?

Accepted Answer

Electron transport chain

Question 15

Which of the following best describes the fate of pyruvate in the presence of oxygen?

Accepted Answer

It is converted into acetyl-CoA and enters the Krebs cycle

Question 16

Which equation correctly represents the ATP yield from one molecule of glucose during aerobic respiration?

Accepted Answer

$$C_6H_{12}O_6$ + 6 O_2$ ightarrow 6 CO_2$ + 6 H_2O + 36-38 	ext{ATP}$$

Question 17

Which of the following statements about metabolism is correct?

Accepted Answer

It includes all chemical reactions in an organism, both anabolic and catabolic

Question 18

Which process is shared by both plant and animal cells for energy production?

Accepted Answer

Cellular respiration

Question 19

Which of the following is a multi-step process that involves glycolysis, the Krebs cycle, and the electron transport chain?

Accepted Answer

Aerobic cellular respiration

Question 20

A mutation prevents the formation of NADH during glycolysis. What is the most immediate consequence for the cell?

Accepted Answer

Reduced electron supply for the electron transport chain

Cellular Respiration: Pathways and Processes

Study Guide - Practice Questions