There is no NET change in the concentration of products or reactants what a reaction is at equilibrium. Reactions that are not reversible-often involve regulatory enzymes. 1 enzyme for forward run. 1 enzyme for reverse run. Enzymes Almost all enzymes are proteins.
Enzymes are catalysts.
They make a reaction happen faster. They are selective. Enzymes have active sites where there is a complementary fit between an enzyme and its substrate. Increasing temperature will increase the rate of a reaction up to a point. A very high temperature will denature the enzyme.