Senior Secondary (HKDSE) · Biology

Cellular energetics: Practice Questions

5 multiple-choice questions marked as you go, and 5 written questions with worked solutions. All on Cellular energetics.

10 questions24 marksFree, no account

Question 1

1 mark

Which of the following statements correctly describes a feature of enzymes?

Question 2

1 mark

The primary function of the reduced coenzyme produced during the light-dependent reactions of photosynthesis is to provide high-energy electrons for which specific step in the Calvin cycle?

Question 3

1 mark

In the carbon fixation stage (Calvin cycle) of photosynthesis, the conversion of the 3-carbon compound (3-phosphoglycerate) into triose phosphate is a key step. Which of the following correctly describes the roles of the products from the photochemical reactions in this specific step?

Question 4

1 mark

Which of the following statements correctly compares anabolism and catabolism?

Question 5

1 mark

A plant is kept in an environment with a constant temperature of \( 25^\circ C \) and a high light intensity. If the rate of photosynthesis does not increase further when light intensity is raised, which of the following is most likely acting as the limiting factor?

Question 6

2 marks

Briefly describe the role of the active site in an enzyme-catalysed reaction.

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Question 7

4 marks

In anaerobic respiration, glycolysis produces ATP and NADH. Explain the critical role of fermentation in allowing glycolysis to continue under these conditions.

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Question 8

5 marks

In the context of aerobic respiration, explain the metabolic necessity of oxidative phosphorylation for the continued operation of the Krebs cycle in the mitochondrial matrix.

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Question 9

3 marks

a) Define metabolism.
b) State the primary difference between a catabolic process and an anabolic process.

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Question 10

5 marks

Describe the main stages of aerobic respiration in a eukaryotic cell, including the specific site within the cell where each stage occurs and the key products (e.g., ATP, NADH, FADH\( _2 \), \( \text{CO}_2 \)) generated in each stage.

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