39. Which of the following statements about the characteristics of allosteric enzymes is correct? (A) Allosteric enzymes are often monomeric. (B) The effectors of allosteric enzymes are typically enzyme inhibitors. (C) Reactions catalyzed by allosteric enzymes generally follow Michaclis- Menten kinetics. (D) Most allosteric enzymes are regulated through protein phosphorylation. (E) Binding of an effector molecule on a non-catalytic site of the enzyme can result in a change in substrate binding affinity.