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IB Biology SL C1.1 Enzymes and Metabolism Questions

Practise IB Biology SL C1.1 by explaining enzyme specificity, metabolic reactions and rate evidence from temperature, pH and substrate experiments.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Identify enzyme-catalysed steps in metabolism and classify reactions as anabolic or catabolic, including condensation, hydrolysis and oxidation.
  • Relate enzyme tertiary structure and active-site shape to substrate specificity, comparing lock-and-key and induced-fit binding.
  • Explain how temperature and pH change enzyme activity through molecular collisions, active-site bonding and denaturation.
  • Interpret enzyme activity data for temperature, pH and substrate concentration; identify optima and saturation and calculate rates.
  • Choose suitable measurements, controls and repeats to calculate enzyme activity and evaluate assay reliability.
  • Interpret enzyme-catalysed energy profiles to identify reduced activation energy with unchanged reactant and product energies.

Covered syllabus points

C1.1.1—Enzymes as catalystsC1.1.2—Role in metabolismC1.1.3—Anabolic and catabolic reactionsC1.1.4—Enzymes as globular proteinsC1.1.5—Induced-fit bindingC1.1.6—Molecular motionC1.1.7—Relationships between structure and functionC1.1.8—Effects on enzyme activityC1.1.9—Measuring enzyme reactionsC1.1.10—Effect of enzymes on activation energy

Question 1

[Maximum number: 3]

Question (a)

(a)

Define metabolism.

[ 1 ]

Question (b)

(b)

Identify the following processes as either anabolism or catabolism by placing a tick (✓)(\checkmark) in the correct box.

Table for Question (b) — IB Biology SL
[ 2 ]

Question 2

[Maximum number: 1]

The diagram shows some of the metabolic processes taking place in a plant cell.

Figure for Question 2 — IB Biology SL

With reference to the diagram, identify one example of catabolism.

Question 3

[Maximum number: 3]

The image represents the structure of the enzyme Rubisco from common pea (Pisum sativum).

Figure for Question 3 — IB Biology SL

Question (a)

(a)

State a role of the active site of an enzyme.

[ 1 ]

Question (b)

(b)

Outline one factor that could affect the activity of Rubisco.

[ 2 ]
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