IB Biology SL 8.1.10 Enzyme catalysis Question Bank
Practise IB Biology SL 8.1.10 by explaining how enzymes speed substrate-specific reactions by lowering activation energy.
- Syllabus
- First assessment 2025
- Course
- Biology SL
- Level
- SL
Exam points
- Explain that enzymes catalyse reactions by lowering activation energy without changing overall energy change.
- Relate substrate specificity and enzyme-substrate complexes to biological catalysis.
C1.1.10—Effect of enzymes on activation energy question 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?
A
X is the activation energy with an enzyme and Z is the net energy released from the reaction.
B
X is the energy released from the reaction and Y is the activation energy with an enzyme.
C
Y is the energy released with an enzyme and Z is the energy released when bonds are broken.
D
Y is the activation energy with an enzyme and Z is the net energy released.
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