Q: Which of the following equations correctly represents the overall process of 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 main purpose of cellular respiration in eukaryotic cells?

Accepted Answer

To break down glucose and other molecules to produce ATP 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 correctly matches the location of each stage of cellular respiration in eukaryotic cells?

Accepted Answer

Glycolysis: cytosol; Citric acid cycle: mitochondrial matrix; Electron transport chain: inner mitochondrial membrane

Question 4

What is the primary role of oxygen in cellular respiration?

Accepted Answer

To accept electrons at the end of the electron transport chain, forming water

Question 5

If a poison inhibits the function of ATP synthase, which process will be directly affected?

Accepted Answer

The generation of ATP from ADP and $$P_i$$ during oxidative phosphorylation

Question 6

Which of the following equations correctly represents the overall process of 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 7

A patient is diagnosed with a mitochondrial disorder that impairs the function of Complex I in the electron transport chain. Which of the following would most likely be observed in this patient’s cells?

Accepted Answer

Decreased ATP production due to reduced proton gradient formation

Question 8

Which molecule is produced during both lactic acid fermentation and alcoholic fermentation, allowing glycolysis to continue in the absence of oxygen?

Accepted Answer

NAD+

Question 9

In the citric acid cycle, how many NADH molecules are produced per glucose molecule?

Accepted Answer

6

Question 10

Which of the following best explains why the electron transport chain and chemiosmosis are considered coupled processes?

Accepted Answer

The electron transport chain creates a proton gradient that drives ATP synthesis via chemiosmosis

Question 11

A muscle cell is deprived of oxygen. Which of the following will most likely occur?

Accepted Answer

The cell will switch to lactic acid fermentation, regenerating NAD+ and producing lactate

Question 12

Which of the following is a correct sequence of events for the complete oxidation of glucose in aerobic respiration?

Accepted Answer

Glycolysis → Pyruvate processing → Citric acid cycle → Electron transport chain

Question 13

If a cell is unable to regenerate NAD+ during glycolysis, what will be the immediate consequence?

Accepted Answer

Glycolysis will stop, and ATP production will decrease

Question 14

Which of the following statements about the citric acid cycle is correct?

Accepted Answer

It generates high-energy electron carriers NADH and FADH2

Question 15

A researcher adds a chemical that makes the inner mitochondrial membrane permeable to protons. What is the most likely effect on ATP synthesis?

Accepted Answer

ATP synthesis will decrease because the proton gradient is dissipated

Question 16

Which of the following best explains why fermentation is less efficient than aerobic respiration?

Accepted Answer

Fermentation does not use an electron transport chain to maximize ATP yield

Question 17

In alcoholic fermentation, which of the following is released as a byproduct?

Accepted Answer

CO2

Question 18

Which of the following is the correct formula for the net ATP yield from one molecule of glucose during aerobic respiration in eukaryotic cells?

Accepted Answer

$$29$$ ATP

Question 19

Which of the following best describes the role of NADH and FADH2 in cellular respiration?

Accepted Answer

They carry high-energy electrons to the electron transport chain

Question 20

A person is exercising vigorously and their muscles begin to feel sore. Which process is most likely responsible for this sensation?

Accepted Answer

Lactic acid fermentation in muscle cells

Cellular Respiration and Fermentation: ATP Production in Cells

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