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

Practise IB Biology SL 8.1.10 by explaining how enzymes speed substrate-specific reactions by lowering activation energy.

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]

The graph shows energy changes during a reaction both with and without an enzyme present.

Which statement correctly identifies two of the regions labelled X, Y and Z in the graph?

X is the activation energy with an enzyme and Z is the net energy released from the reaction.

X is the energy released from the reaction and Y is the activation energy with an enzyme.

Y is the energy released with an enzyme and Z is the energy released when bonds are broken.

Y is the activation energy with an enzyme and Z is the net energy released.

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