Cellular Respiration Quiz

What is the main product of glycolysis?

• Glucose

• Pyruvate

• Acetyl-CoA

• Lactate

Which coenzyme is primarily involved in transferring electrons during cellular respiration?

• ATP

• NADH

• FADH2

• CoA

What is the final electron acceptor in aerobic metabolism?

• Carbon dioxide

• Oxygen

• Water

• Glucose

How many ATP molecules are produced directly in the citric acid cycle per acetyl-CoA molecule?

• 1

• 2

• 3

• 4

Why is oxygen necessary for aerobic metabolism?

• It breaks down glucose into pyruvate.

• It acts as the final electron acceptor in the electron transport chain.

• It synthesizes ATP directly.

• It converts lactate into pyruvate.

What is the role of NADH in cellular respiration?

• To phosphorylate ADP into ATP

• To donate electrons to the electron transport chain

• To convert glucose into pyruvate

• To synthesize fatty acids

Which process produces the most ATP in aerobic metabolism?

• Glycolysis

• Citric acid cycle

• Oxidative phosphorylation

• Pyruvate dehydrogenation

What happens to pyruvate under anaerobic conditions in muscle cells?

• It is converted into acetyl-CoA.

• It is reduced to lactate.

• It enters the citric acid cycle.

• It is oxidized to carbon dioxide.

If a cell lacks oxygen, which process will it rely on to produce ATP?

• Aerobic respiration

• Anaerobic glycolysis

• Oxidative phosphorylation

• Citric acid cycle

During intense exercise, why does lactic acid accumulate in muscles?

• Oxygen supply is insufficient for aerobic respiration.

• Pyruvate is converted into acetyl-CoA.

• The citric acid cycle stops functioning.

• ATP production exceeds energy demand.