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IB Biology SL 1.1.8 Effects on Enzyme Activity

Practise interpreting enzyme-activity graphs and experiments, explaining how temperature, pH and substrate concentration change reaction rate and active-site function.

Syllabus
First assessment 2025
Course
Biology SL
Level
SL

Exam points

  • Interpret enzyme-activity graphs for temperature, pH and substrate concentration and identify optimum conditions.
  • Explain rate changes using collisions, active-site shape, denaturation and substrate saturation.
  • Evaluate enzyme experiments using controls, error bars and evidence from measured reaction rates.

C1.1.8—Effects on enzyme activity question 1

[Maximum number: 2]

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

Figure for Question C1.1.8—Effects on enzyme activity question 1 — IB Biology SL

Outline one factor that could affect the activity of Rubisco.

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