Why does an enzyme stop working at a high temperature?
Answer and explanation
Correct answer: A. The active site changes shape, so the substrate no longer fits
- Step 1: High temperature breaks bonds in the protein. Step 2. The active site is denatured, so the substrate cannot fit. Answer: The active site changes shape, so the substrate no longer fits. Why not the others: The enzyme is not used up in the reaction.
Practise more Organisation, Digestion and Circulation.
Free questions with an explanation for every one, and full timed UK GCSE mock tests.
More Organisation, Digestion and Circulation questions
- Which enzyme breaks down starch into sugars in the mouth?
- Bile is made in the liver. What is its role in digestion?
- Which food test gives a brick-red precipitate when heated with Benedict's solution?
- What is the function of the villi in the small intestine?
- Which blood vessel carries blood away from the heart to the body?
- Which component of blood carries oxygen around the body?