Biology for IGCSE & O level - Enzymes (Section 4 - No. 40)
What is a catalyst?
A substance that speeds up a chemical reaction and is chemically changed at the end of the reaction.
A substance that slows down a chemical reaction and is chemically changed at the end of the reaction.
A substance that speeds up a chemical reaction and is not chemically changed at the end of the reaction.
A substance that slows down a chemical reaction and is not chemically changed at the end of the reaction.
Explanation
A catalyst speeds up a reaction but is unchanged by the reaction.
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