Q: Which of the following equations correctly represents the overall process of aerobic cellular respiration?

$$\mathrm{C_6H_{12}O_6$} + 6\ \mathrm{O_2$} \rightarrow 6\ \mathrm{CO_2$} + 6\ \mathrm{H_2O} + \text{energy (ATP)}$$

Question 1

Which of the following best describes the relationship between photosynthesis and cellular respiration in the context of energy flow in living systems?

Accepted Answer

Photosynthesis stores energy in organic molecules, and cellular respiration releases that energy for cellular work.

Question 2

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

Accepted Answer

$$2$$ ATP and $$2$$ NADH

Question 3

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 4

In the absence of oxygen, which process allows glycolysis to continue by regenerating NAD$$^+$$?

Accepted Answer

Fermentation

Question 5

Which of the following is a correct sequence of events for aerobic cellular respiration in eukaryotic cells?

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Oxidative Phosphorylation

Question 6

What is the primary function of the electron transport chain in mitochondria?

Accepted Answer

To transfer electrons from NADH and FADH$$_2 to $$oxygen, creating a proton gradient

Question 7

Which of the following equations correctly represents the overall process of aerobic cellular respiration?

Accepted Answer

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

Question 8

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

Accepted Answer

Oxidative phosphorylation

Question 9

A yeast cell is placed in an anaerobic environment. Which end product will it most likely produce to regenerate NAD$$^+$$?

Accepted Answer

Ethanol

Question 10

Which of the following best explains why aerobic respiration is more efficient than anaerobic respiration?

Accepted Answer

Aerobic respiration produces more ATP per glucose molecule because oxygen acts as the final electron acceptor, allowing complete oxidation of glucose.

Question 11

Which molecule is the final electron acceptor in the electron transport chain of aerobic respiration?

Accepted Answer

O$$_2$$

Question 12

What is the main purpose of fermentation in muscle cells during intense exercise?

Accepted Answer

To regenerate NAD$$^+ so $$glycolysis can continue

Question 13

Which of the following statements about substrate-level phosphorylation is correct?

Accepted Answer

It involves the direct transfer of a phosphate group to ADP from an intermediate substrate.

Question 14

A person is fasting and has depleted their carbohydrate stores. Which macromolecule will their body most likely use next for energy production?

Accepted Answer

Fats

Question 15

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The use of a proton gradient to drive the synthesis of ATP via ATP synthase

Question 16

Which of the following is NOT an output of glycolysis?

Accepted Answer

CO$$_2$$

Question 17

During the citric acid cycle, which of the following occurs for each acetyl-CoA that enters the cycle?

Accepted Answer

Two molecules of CO$$_2$$ are released, and three NAD$$^+$$ are reduced to NADH.

Question 18

Which of the following best explains why the maximum yield of ATP from one molecule of glucose is rarely achieved in eukaryotic cells?

Accepted Answer

Some protons leak across the mitochondrial membrane, and some intermediates are used for other biosynthetic pathways.

Question 19

Which of the following is a real-world example of substrate-level phosphorylation?

Accepted Answer

ATP production during glycolysis in muscle cells

Question 20

A mutation prevents the formation of the proton gradient across the inner mitochondrial membrane. Which process would be most directly affected?

Accepted Answer

Oxidative phosphorylation

Cellular Respiration and Fermentation: Energy Processing in Cells

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