Phosphofructokinase- 1 PFK-1 liver allosteric enzyme responsible for phosphorylating fructose 6-phasphate to fructose 16-bisphosphate in glycolysis. One is that allosteric enzymes do not follow the Michaelis-Menten Kinetics. Biology Pictures Biochemistry Enzymes Enzymes Activity Describe the characteristics of a Michaelis-Menten enzyme and an allosteric enzyme. . There are two forms of the enzyme with different activities and different substrate affinities. This ensures an economical way of avoiding the overproduction and accumulation of cellular building blocks. Allosteric enzymes have the important task of making digestion easier. The binding causes conformational changes in the protein which alters its catalytic characteristics. Allosteric or Regulatory enzymes have multiple subunits Quaternary Structure and multiple active sites. Allosteric enzymes are those enzymes which have an additional site apart from the active s...