All of these are unique properties of how an allosteric enzyme could function or be regulated except for: select one: a. sigmoidal behavior when measuring v0 vs [s] b. larger size and having multiple subunits like in hemoglobin c. homotropic regulation like o2 binding to hemoglobin d. feedback inhibition like inhibition of threonine dehydratase by l-isoleucine e. under non-saturating conditions ([e] > [s]) addition of substrate increases v0.