Q: Which of the following best describes the overall chemical equation for aerobic cellular respiration in eukaryotic cells?

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 \rightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + \text{Energy (ATP + heat)}$$

Question 1

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

Accepted Answer

$$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6 + 6 \mathrm{O}_2 ightarrow 6 \mathrm{CO}_2 + 6 \mathrm{H}_2\mathrm{O} + 	ext{Energy (ATP + heat)}$$

Question 2

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

Accepted Answer

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

Question 3

Which process in cellular respiration directly produces the greatest number of ATP molecules per glucose molecule?

Accepted Answer

Oxidative phosphorylation

Question 4

What is the net gain of ATP molecules produced by glycolysis from one molecule of glucose?

Accepted Answer

$$2$$

Question 5

Which of the following statements about redox reactions in cellular respiration is correct?

Accepted Answer

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

Question 6

In the citric acid cycle, how many NADH molecules are produced per turn of the cycle?

Accepted Answer

$$3$$

Question 7

Which molecule is formed when pyruvate is converted before entering the citric acid cycle?

Accepted Answer

Acetyl CoA

Question 8

What is the role of NAD+ in cellular respiration?

Accepted Answer

It functions as an electron carrier, accepting electrons during redox reactions.

Question 9

Which of the following best explains why the exact number of ATP molecules produced from one glucose molecule during cellular respiration is not always known?

Accepted Answer

The ratio of NADH to ATP is not a whole number, and the proton-motive force is used for other work.

Question 10

Which process allows cells to produce ATP in the absence of oxygen by regenerating NAD+ from NADH?

Accepted Answer

Fermentation

Question 11

In lactic acid fermentation, what is the final product formed from pyruvate?

Accepted Answer

Lactate

Question 12

Which of the following is a major difference between fermentation and aerobic respiration?

Accepted Answer

Aerobic respiration produces much more ATP per glucose molecule than fermentation.

Question 13

What is the main function of the electron transport chain in cellular respiration?

Accepted Answer

To pump protons across the mitochondrial membrane, creating a gradient for ATP synthesis

Question 14

Which of the following best describes chemiosmosis?

Accepted Answer

The use of energy in a proton gradient to drive the synthesis of ATP

Question 15

Which of the following organisms can survive using either fermentation or cellular respiration depending on oxygen availability?

Accepted Answer

Facultative anaerobes

Question 16

If a cell's ATP concentration drops, what is the expected effect on the rate of cellular respiration?

Accepted Answer

Cellular respiration speeds up

Question 17

Which of the following is true about glycolysis?

Accepted Answer

It occurs in the cytoplasm and produces pyruvate.

Question 18

During alcohol fermentation, what is the fate of pyruvate?

Accepted Answer

It is converted to ethanol and carbon dioxide.

Question 19

Which of the following best explains why organic molecules with many hydrogen atoms are excellent sources of high-energy electrons?

Accepted Answer

Hydrogen atoms have electrons that are easily transferred to electron carriers, releasing energy.

Question 20

Which of the following is a waste product of aerobic cellular respiration?

Accepted Answer

Carbon dioxide ($$\mathrm{CO}_2)$$

Cellular Respiration: Harvesting Chemical Energy

Study Guide - Practice Questions

Study Guide - Flashcards