Question 1

Which of the following best describes the main function of cellular respiration in living organisms?

Accepted Answer

To harvest chemical energy from food molecules and convert it into ATP.

Question 2

In the overall equation for aerobic cellular respiration, which molecule is oxidized and which is reduced?

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} ightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \mathrm{ATP} + 	ext{heat}$$

Accepted Answer

Glucose is oxidized; oxygen is reduced.

Question 3

Which of the following statements about redox reactions is correct?

Accepted Answer

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

Question 4

During cellular respiration, which of the following best describes the fate of the oxygen molecules ($$\mathrm{O_2$}) $$consumed by the cell?

Accepted Answer

They are reduced to form water ($$\mathrm{H_2O}).$$

Question 5

Which of the following is a reduced form of an electron carrier used in cellular respiration?

Accepted Answer

NADH

Question 6

A student is analyzing the following reaction: $$2\mathrm{NaH} \rightarrow 2\mathrm{Na} + \mathrm{H_2$}. $$Has sodium (Na) been oxidized or reduced?

Accepted Answer

Sodium has been oxidized.

Question 7

In the reaction $$\mathrm{CH_4$} + 2\mathrm{O_2$} \rightarrow \mathrm{CO_2$} + 2\mathrm{H_2O}$$, what happens to the carbon atom in methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

It is oxidized.

Question 8

Which of the following best explains why life does not violate the second law of thermodynamics?

Accepted Answer

Life maintains order by increasing the entropy of its surroundings through energy transformations.

Question 9

Which of the following is an example of a catabolic process in cellular metabolism?

Accepted Answer

Breakdown of glucose to carbon dioxide and water.

Question 10

A patient is unable to efficiently reduce NAD+ to NADH during cellular respiration. Which of the following consequences is most likely?

Accepted Answer

The patient will have decreased ATP production due to impaired electron transport.

Question 11

Which of the following best describes the relationship between photosynthesis and cellular respiration in an ecosystem?

Accepted Answer

Photosynthesis converts carbon dioxide and water into organic molecules and oxygen, which are then used in cellular respiration.

Question 12

Which of the following statements about electron carriers is correct?

Accepted Answer

NADH, NADPH, and FADH2 are reduced forms that carry electrons.

Question 13

During the process of aerobic cellular respiration, which of the following is a direct product of the oxidation of glucose?

Accepted Answer

Carbon dioxide

Question 14

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP provides energy for most cellular work.

Question 15

If a cell is unable to perform oxidative phosphorylation, which of the following would most likely occur?

Accepted Answer

The cell would rely more on fermentation to generate ATP.

Question 16

Which of the following is true regarding the entropy changes during cellular respiration?

Accepted Answer

Entropy of the universe increases as some energy is lost as heat.

Question 17

In the reaction $$2\mathrm{H_2O} \rightarrow 2\mathrm{H_2$} + \mathrm{O_2$}$$, what happens to the oxygen atoms?

Accepted Answer

Oxygen is oxidized.

Question 18

Which of the following best explains why ecosystems require a constant influx of energy?

Accepted Answer

Because energy is lost as heat during metabolic processes, increasing entropy.

Question 19

Which of the following is a correct application of the OIL RIG mnemonic in redox reactions?

Accepted Answer

Oxidation is loss of electrons; reduction is gain of electrons.

Question 20

Which of the following best describes the relationship between catabolic and anabolic reactions in cellular metabolism?

Accepted Answer

Catabolic reactions harvest energy by breaking down molecules, providing energy and materials for anabolic reactions.

Cellular Respiration and Redox Reactions: Energy Harvesting in Cells

Guida di studio - Domande di pratica

Study guide - Flashcard