When the velocity of an enzymatic reaction is 30% Vmax, what is the relationship between Km and substrate concentration? a) 0.4Km=[S] b) Km=0.4[S] c) Km=4[S] d) [S]=40Km Question 7 The glycogen phosphorylase enzyme is activated/stimulated by: a) phosphorylation of selected serine residues found in the phosphorylase b form of the enzyme. b) the actions of positive allosteric modulators such as AMP. c) proteolysis through the actions of trypsin followed by self digestion. d) the association of 4 phosphorylase b subunits to produce phosphorylase a, a functional oligomeric protein. e) a and b