Biomolecules Question 67

67. The catalytic efficiency of two different enzymes can be compared by the

[2005]

(a) formation of the product

(b) $pH$ optimum value

(c) $K_m$ value

(d) molecular size of the enzyme

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Answer : c

Hints & Solutions

(c) $K_m$ (Michealis 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. $K_m$ is inversely proportional to affinity of enzyme far its substrate.