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IB Biology HL C1.1.8 Effects on Enzyme Activity Questions

Practise analysing enzyme-kinetics data at HL depth, including immobilised enzymes, active-site changes, optimum conditions and experimental limits in temperature, pH and…

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Interpret temperature, pH and substrate-concentration graphs or tables to identify optimum conditions, saturation plateaus and denaturation-related declines.
  • Explain enzyme-rate changes using collision frequency, pH-dependent active-site bonding, conformational change and denaturation.
  • Compare or determine enzyme reaction rates from measured data, including substrate saturation and factor-dependent differences.

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Study C1.1.8—Effects on enzyme activity conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL C1.1.8 Effects on Enzyme Activity Questions question 1

[Maximum number: 3]

Cholinergic synapses use acetylcholine as their neurotransmitter. They are widespread in the body, passing on signals to muscle cells. These synapses are affected by neonicotinoid pesticides.

The diagrams, which are not drawn to scale, show the synapse between two neurons and a detail of the synaptic cleft.

Figure for Question IB Biology HL C1.1.8 Effects on Enzyme Activity Questions question 1 — IB Biology HL

Explain what happens to an enzyme if there is a change of pH .

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