Question

select the correct statement(s) about enzymes.
enzymes are proteins.
enzymes are not substrate specific.
enzymes decrease activation energy.
all enzymes work at a ph of 7.
enzymes decrease the rates of biochemical reactions.

Explanation:

• Enzymes are mostly proteins, but some are RNA - ribozymes. So "Enzymes are proteins" is not entirely correct.
• Enzymes are highly substrate - specific.
• Enzymes lower the activation energy required for a biochemical reaction, which speeds up the reaction rate.
• Different enzymes have different optimal pH values, not all work at pH 7.
• Enzymes increase the rates of biochemical reactions, not decrease them.

Answer:

Enzymes decrease activation energy.