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AQA GCSE Biology · Enzymes · 6 marks
Explain why the rate of reaction falls when the enzyme is heated above 50 °C.
Your answer
The enzyme denatures and the active site changes shape, so it stops working properly.
What's right —you named denaturing and the active site. That's 2 marks.
What went wrong —“stops working properly” is too vague. The scheme wants the effect on the substrate.
How to improve —write “the substrate can no longer bind to the active site”. That's both missing marks.
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Explain why the rate of reaction falls when the enzyme is heated above 50 °C.
Your answer
The enzyme denatures and the active site changes shape, so it stops working
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How enzymes work
Every enzyme has an active site shaped to fit one substrate. Heat it past 50 °C and that shape is lost — the reaction stops.
Substrate · active site
Write “changes shape”, never “the enzyme dies”.
Understand the topic
Front
What is the active site?
Tap to reveal12 / 24 cards mastered
Remember what matters
Which factor can denature an enzyme?
- ALow temperature
- High temperature
- CLow substrate concentration
- DMore enzyme molecules
Correct. High temperatures change the shape of the active site.
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Biology · by topic
- Enzymes86%
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