Question 1

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

Accepted Answer

$$C_6H_{12}O_6$ + 6O_2 \rightarrow 6CO_2 + 6H_2O + ATP$$

Question 2

During which stage of cellular respiration is the majority of ATP produced?

Accepted Answer

Electron Transport Chain and Chemiosmosis

Question 3

What is the primary role of oxygen in aerobic cellular respiration?

Accepted Answer

To act as the final electron acceptor in the electron transport chain

Question 4

Which molecule is reduced during the process of cellular respiration?

Accepted Answer

Oxygen ($$O_2)$$

Question 5

In substrate-level phosphorylation, how is ATP generated?

Accepted Answer

By the direct transfer of a phosphate group from a substrate to ADP by an enzyme

Question 6

Which of the following best explains why anaerobic respiration produces less ATP than aerobic respiration?

Accepted Answer

Anaerobic respiration uses alternative electron acceptors that yield less energy than oxygen

Question 7

A patient’s muscle cells are deprived of oxygen during intense exercise. Which process allows the cells to continue producing ATP?

Accepted Answer

Lactic acid fermentation

Question 8

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

Accepted Answer

Glycolysis → Pyruvate Oxidation → Citric Acid Cycle → Electron Transport Chain

Question 9

Which electron carrier is in its reduced form after accepting electrons during cellular respiration?

Accepted Answer

NADH

Question 10

A poison that blocks ATP synthase would directly inhibit which process?

Accepted Answer

Chemiosmosis

Question 11

Which of the following best describes the role of the electron transport chain in mitochondria?

Accepted Answer

It pumps protons across the inner mitochondrial membrane to create a proton gradient

Question 12

If a cell is forced to rely solely on fermentation for ATP production, which of the following will most likely accumulate?

Accepted Answer

Lactic acid or ethanol

Question 13

Which process is responsible for the majority of heat released during cellular respiration?

Accepted Answer

Electron transport chain and chemiosmosis

Question 14

Which of the following is an example of catabolism?

Accepted Answer

Breakdown of glucose to pyruvate during glycolysis

Question 15

A mutation prevents a cell from converting pyruvate to acetyl-CoA. Which process will be directly affected?

Accepted Answer

Citric Acid Cycle (Krebs Cycle)

Question 16

Which of the following statements about oxidative phosphorylation is correct?

Accepted Answer

It uses energy from electrons to pump protons and generate ATP

Question 17

In the absence of oxygen, which molecule can act as an alternative final electron acceptor in some prokaryotes?

Accepted Answer

Nitrate ($$NO_3$$^-$$)

Question 18

Which of the following best explains why ATP is considered the 'energy currency' of the cell?

Accepted Answer

It stores energy in its phosphate bonds that can be easily released for cellular work

Question 19

Which process is shared by both aerobic respiration and fermentation?

Accepted Answer

Glycolysis

Question 20

A person with a genetic defect in ATP synthase would have trouble with which of the following?

Accepted Answer

Producing ATP via chemiosmosis

Cellular Respiration and Energy Harvesting in Cells

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