What is a catalyst?
A. A substance that slows down a reaction and is used up.
B. A substance that increases the speed of a reaction and is used up.
C. A substance that increases the speed of a reaction without being changed or used up.
D. A substance that prevents a reaction from occurring.
Preview next quiz:
What happens to an enzyme when it reaches its optimum temperature and then the temperature continues to increase?
A. It becomes more active
B. It denatures and is no longer active
C. It breaks down into smaller molecules
D. It binds more tightly to substrates
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