Unit of Km is:: (A) second-1, (B) Moles second-1, (C) Millimoles, (D) Millimoles Litre-1
Answer is D. The Km is the substrate concentration at 1/2 Vmax. As Km is the concentration, unit of Km will be the unit of concentration Km is a measure of a substrate's affinity for the enzyme. It is inversely propoional to the affinity.