IB Diploma Programme (DP) - SL & HL · Biology

C1.2 Cell respiration (Molecules): Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on C1.2 Cell respiration (Molecules).

10 questions22 marksFree, no account

Question 1

1 mark

During aerobic cell respiration, which of the following processes occurs entirely within the mitochondrial matrix?

Question 2

1 mark

What is the primary purpose of reducing pyruvate during anaerobic fermentation in human muscle cells?

Question 3

1 mark

Phosphofructokinase (PFK) is the main regulatory enzyme in glycolysis. Which combination of conditions represents effective allosteric inhibition signals for PFK, thereby signaling high cellular energy status and slowing down glucose breakdown?

Question 4

1 mark

During the process of cell respiration, what is the role of molecular oxygen (\(O_2\)) in the mitochondria of a eukaryotic cell?

Question 5

1 mark

During the Link Reaction (pyruvate oxidation), which molecule is produced as carbon dioxide is removed from pyruvate, and subsequently enters the Krebs cycle?

Question 6

2 marks

State the net gain of ATP molecules produced directly from substrate-level phosphorylation during glycolysis per molecule of glucose.

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Question 7

3 marks

Explain the structural advantage gained by the inner mitochondrial membrane being highly folded into cristae.

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Question 8

5 marks

Explain the fundamental purpose of maintaining a steep proton gradient (\(H^+\)) across the inner mitochondrial membrane during oxidative phosphorylation.

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Question 9

3 marks

State the cellular location where glycolysis occurs and outline the main products of alcoholic fermentation in yeast, clearly identifying the carbon dioxide output.

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Question 10

4 marks

Distinguish between substrate-level phosphorylation and oxidative phosphorylation, providing the specific stages of aerobic cell respiration where each mechanism contributes significantly to ATP production.

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