$$\text{Sugar} + \text{O}_2 \rightarrow \text{CO}_2 + \text{H}_2\text{O} + \text{energy}$$

Question 1

Which of the following best describes the overall chemical equation for cellular respiration?

Accepted Answer

$$	ext{Sugar} + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O} + 	ext{energy}$$

Question 2

During cellular respiration, which molecule is the final electron acceptor in the electron transport chain under aerobic conditions?

Accepted Answer

Oxygen ($$	ext{O}_2)$$

Question 3

Why does cellular respiration produce less weight in carbon dioxide than the original weight of glucose and oxygen combined?

Accepted Answer

Water is a smaller molecule than carbon dioxide and some mass is lost as water.

Question 4

Which process is responsible for coupling endergonic and exergonic reactions in cells?

Accepted Answer

ATP hydrolysis and synthesis

Question 5

A patient is unable to use oxygen efficiently in their cells. Which process would be most affected?

Accepted Answer

Aerobic respiration

Question 6

Which of the following best explains why ATP is considered 'unstable'?

Accepted Answer

The high-energy phosphate bonds are easily broken, releasing energy quickly.

Question 7

Which of the following is a correct comparison between photosynthesis and cellular respiration?

Accepted Answer

Photosynthesis stores energy in glucose, while cellular respiration releases energy from glucose.

Question 8

In the context of cellular respiration, what is the main purpose of redox reactions?

Accepted Answer

To gradually release energy from glucose for ATP production

Question 9

Which of the following stages of cellular respiration directly produces the most ATP?

Accepted Answer

Oxidative phosphorylation (electron transport chain and chemiosmosis)

Question 10

If a cell is forced to rely on fermentation instead of aerobic respiration, what is the most likely consequence?

Accepted Answer

The cell will produce much less ATP per glucose molecule.

Question 11

Which of the following best describes substrate-level phosphorylation?

Accepted Answer

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

Question 12

A scientist measures the ATP yield from glucose metabolism in two different conditions: with and without oxygen. Which result would be expected?

Accepted Answer

With oxygen: about 29 ATP per glucose; without oxygen: much less ATP

Question 13

Which of the following is a real-world example of the importance of redox reactions in cellular respiration?

Accepted Answer

The gradual release of energy from glucose prevents cells from overheating and allows efficient ATP production.

Question 14

Which of the following best explains why the theoretical maximum ATP yield from glucose is rarely achieved in living cells?

Accepted Answer

Some energy is lost as heat and some protons leak across the mitochondrial membrane.

Question 15

During which stage of cellular respiration is carbon dioxide ($$	ext{CO}_2) $$first released?

Accepted Answer

Pyruvate processing

Question 16

Which of the following statements about the relationship between energy and atoms in photosynthesis and cellular respiration is correct?

Accepted Answer

Both processes involve the conversion of energy and the rearrangement of atoms, especially carbon.

Question 17

A marathon runner's muscle cells switch to fermentation during the final sprint. What is the most likely reason for this switch?

Accepted Answer

Oxygen supply is insufficient for aerobic respiration.

Question 18

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

Accepted Answer

They carry electrons to the electron transport chain for ATP production.

Question 19

If a mutation prevents the phosphorylation of ADP to ATP, which process would be directly affected?

Accepted Answer

All energy-requiring cellular processes

Question 20

Which of the following is a key difference between aerobic and anaerobic respiration?

Accepted Answer

Aerobic respiration uses oxygen as the final electron acceptor, while anaerobic respiration uses other molecules.

Cellular Respiration and Energy Processing: Study Notes

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