Question

Which aspect of a chemical reaction is affected by enzymes?

Answer 1

It speeds up the reaction....this makes the reactants turn into products more quicker and makes it stop much slower. Below is a graph for a regular reaction and a reaction with enzymes.  An enzyme is a type of catalyst.

Answer 2

Answer

By lowering energy of activation of the reaction.

Explanation

High energy produced during the metabolism of reactant to product. Due to the large free energy of activation, the speeds of uncatalyzed biochemical reactions are often exceedingly slow. Enzymes lower this energy of activation so that more molecules have adequate energy to carry into the transition state to speed up the rate of reaction.