Q: What is the balanced chemical equation for cellular respiration?

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

Question 1

Which of the following best describes the relationship between cellular respiration and photosynthesis in terms of energy and matter transformation?

Accepted Answer

Photosynthesis converts carbon dioxide and water into glucose and oxygen, while cellular respiration breaks down glucose and oxygen into carbon dioxide and water.

Question 2

What is the balanced chemical equation for cellular respiration?

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{energy}$$

Question 3

During cellular respiration, which molecule acts as the final electron acceptor in the electron transport chain?

Accepted Answer

Oxygen ($$\mathrm{O}_2)$$

Question 4

Which process in cellular respiration produces the most ATP per molecule of glucose?

Accepted Answer

Electron transport chain and oxidative phosphorylation

Question 5

In glycolysis, what is the net gain of ATP molecules per molecule of glucose?

Accepted Answer

2 ATP

Question 6

Which of the following best explains why fats are a more efficient fuel than carbohydrates?

Accepted Answer

Fats have more carbon-hydrogen bonds, which release more energy upon oxidation.

Question 7

What is the main function of ATP synthase in cellular respiration?

Accepted Answer

To synthesize ATP from ADP and inorganic phosphate using the proton gradient.

Question 8

Which statement correctly describes the role of NADH in cellular respiration?

Accepted Answer

NADH donates electrons to the electron transport chain, helping to generate a proton gradient.

Question 9

Which of the following is a product of alcoholic fermentation?

Accepted Answer

Ethanol

Question 10

Obligate anaerobes differ from facultative anaerobes in that obligate anaerobes:

Accepted Answer

Cannot survive in the presence of oxygen.

Question 11

Which of the following best describes the evolutionary significance of glycolysis?

Accepted Answer

It is a universal pathway found in nearly all living organisms, suggesting it evolved early.

Question 12

During the citric acid cycle, which molecule is oxidized to produce carbon dioxide?

Accepted Answer

Pyruvate

Question 13

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

Accepted Answer

Photosynthesis

Question 14

What is the role of oxygen in the electron transport chain?

Accepted Answer

It acts as the final electron acceptor, forming water.

Question 15

Which process allows cells to produce ATP in the absence of oxygen?

Accepted Answer

Fermentation

Question 16

Which of the following statements about lactic acid fermentation is correct?

Accepted Answer

It occurs in muscle cells during intense exercise when oxygen is scarce.

Question 17

What is the main reason why the actual ATP yield per glucose molecule can vary in cellular respiration?

Accepted Answer

Some energy is lost as heat and the efficiency of electron transport can differ between cells.

Question 18

Which of the following best describes the process by which the inner mitochondrial membrane generates the proton gradient necessary for ATP synthesis?

Accepted Answer

Electrons are transferred through protein complexes, pumping protons into the intermembrane space.

Question 19

Which molecule is reduced during the process of cellular respiration?

Accepted Answer

Oxygen

Cellular Respiration and Fermentation: Study Guide

Study Guide - Practice Questions

Study Guide - Flashcards