Question

______________ is defined as an enzyme molecule’s efficiency to convert maximum substrate molecules into product per unit time.

(a) Catalytic efficiency

(b) Miachelis Menten constant

(c) Turn over number

(d) Vmax

The question was asked in a national level competition.

This key question is from Kinetics of Enzyme Catalysed Reaction topic in section Enzyme Kinetics of Enzyme Technology

Answer 1

Right option is (c) Turn over number

The explanation: Turn over number is defined as an enzyme molecule’s efficiency to convert maximum substrate molecules into product per unit time. Turn over number is given Kcat and it denotes the catalytic turn over events that happen per unit time. The turn over number for most enzymes ranges from 1 to 10^5 per second. Miachelis Menten constant is Km which is calculated as substrate concentration, which results in the half- maximal velocity of the enzymatic reaction. Kcat/Km is termed as catalytic efficiency. Vmax is referred to as maximum rate of an enzyme catalyzed reaction.