The correct answers in this question are, (B) They
lower the activation energy of the reaction and (C) they promote the formation of a transition state.
Explanation: Enzymes do not necessarily shift
reaction equilibrium to the products, as there are
reversible enzymatic reactions that can reverse
the pathway back to the substrates. They do
not increase the concentration of the reactants
as the concentration of the reactants is an
independent variable in this process. They do
not decrease the free energy of activation as this
is a constant in every reaction depending on the
substrates and the products