Table 8-2 K M values of some enzymes Enzyme Substrate KLum) Chymotrypsin Acetyl-L-tryptophanamide 5000 Lysozyme Hexa-N-acetylglucosamine 6 B-Galactosidase Lactose 4000 Threonine deaminase Threonine 5000 Carbonic anhydrase CO 8000 Penicillinase Benzylpenicillin 50 ruvate carboxylase Pyruvate 400 HCO3 1000 ATP Arginine-tRNA synthetase Arginine tRNA 0.4 ATP 300