Question

select all that apply
which of the following describe enzymes?
□ they speed up metabolic reactions by lowering their activation energy.
□ they are vitamins.
□ they speed up metabolic reactions by raising their activation energy.
□ most enzymes are proteins.
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Explanation:

Enzymes are biological catalysts. They speed up metabolic reactions by lowering the activation - energy required for the reaction to occur. Most enzymes are proteins. Enzymes are not vitamins.

Answer:

They speed up metabolic reactions by lowering their activation energy.
Most enzymes are proteins.