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

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

Question 1

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

Accepted Answer

ATP is the 'energy currency' of the cell, coupling exergonic and endergonic reactions.

Question 2

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

Accepted Answer

Oxygen ($O_2$)

Question 3

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

Accepted Answer

$C_6H_{12}O_6 + 6O_2 ightarrow 6CO_2 + 6H_2O + 	ext{Energy (ATP + heat)}$

Question 4

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

Accepted Answer

Glucose is oxidized and oxygen is reduced.

Question 5

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

Accepted Answer

2 ATP and 2 NADH

Question 6

Which process directly produces the most ATP during cellular respiration?

Accepted Answer

Oxidative phosphorylation

Question 7

A patient is experiencing muscle fatigue after intense exercise. Which metabolic pathway is most likely responsible for the accumulation of lactate in their muscles?

Accepted Answer

Lactic acid fermentation

Question 8

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

Accepted Answer

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

Question 9

Which of the following is a correct description of substrate-level phosphorylation?

Accepted Answer

ATP is produced by the direct transfer of a phosphate group from a substrate to ADP.

Question 10

During the citric acid cycle, for each acetyl CoA molecule that enters, what are the main products generated?

Accepted Answer

1 ATP, 3 NADH, 1 FADH$_2$, 2 CO$_2$

Question 11

Which of the following statements about the electron transport chain (ETC) is correct?

Accepted Answer

The ETC uses the energy from electrons to pump protons into the intermembrane space.

Question 12

Which of the following best describes chemiosmosis in mitochondria?

Accepted Answer

The movement of protons down their concentration gradient through ATP synthase to generate ATP.

Question 13

If a cell is deprived of oxygen, which of the following processes will stop first?

Accepted Answer

Electron transport chain

Question 14

Which of the following is a correct statement about the fate of pyruvate in the absence of oxygen?

Accepted Answer

Pyruvate is converted to lactate or ethanol through fermentation.

Question 15

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

Accepted Answer

Hydrogen atoms are easily oxidized, releasing high-energy electrons during redox reactions.

Question 16

Which of the following is a real-life application of fermentation?

Accepted Answer

Production of cheese and yogurt by lactic acid fermentation.

Question 17

A mutation causes a defect in ATP synthase in mitochondria. Which process would be most directly affected?

Accepted Answer

Chemiosmosis

Question 18

Which of the following best describes the function of NAD+ in cellular respiration?

Accepted Answer

NAD+ acts as an oxidizing agent, accepting electrons during redox reactions.

Question 19

Which of the following is an example of feedback inhibition in cellular respiration?

Accepted Answer

High levels of ATP inhibit an enzyme in glycolysis, slowing down ATP production.

Cellular Respiration and Fermentation: Study Notes

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