IB Biology HL C1.1.10 Effect of Enzymes on Activation Energy Questions

Practise IB Biology HL 8.1.10 by interpreting energy profiles and explaining how enzyme binding lowers the activation barrier.

Exam points

Interpret energy-profile graphs to identify the lower activation-energy barrier for an enzyme-catalysed reaction while reactant and product energy levels remain unchanged.
Explain that enzyme-substrate binding provides an alternative pathway or stabilizes the transition state, lowering activation energy without removing the energy barrier and increasing reaction rate.

[Maximum number: 1]

(a) The image shows a cell in a section of an onion root tip seen under a light microscope.

The graph shows energy levels throughout an uncatalysed reaction. Draw a curve to show how the action of an enzyme would affect this reaction.

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