Question

What is true about enzymes? A. Enzymes provide the heat energy for a reaction.
B. They lower the energy required for a chemical reaction.
C. They slow the chemical reactions that take place in a cell.
D. They combine with the reactants in a chemical reaction.

Answer 1

B. They lower the energy required for a chemical reaction.  

C. They slow the chemical reactions that take place in a cell.

I believe it's one of these two.

Answer 2

They slow the chemical reactions that take place in a cell.