• # question_answer 120) The catalytic efficiency of two different enzymes can be compared by the A)  Formation of the productB)  pH optimum valueC)  ${{K}_{m}}$valueD)  Molecular size of the enzyme

${{\text{K}}_{\text{m}}}$ (Michaelis-Menten constant). It is defined as that substrate concentration at which under optimum conditions the rate of an enzyme catalysed reaction reaches half the maximum rate. ${{\text{K}}_{\text{m}}}$is inversely proportional to the affinity of enzyme for its substrate.