Which of the following statements is incorrect regarding enzymatic activity ?

Options

A. a) It increases with increase in substrate concentration upto to the saturation point.
B. b) It is highest at optimum pH value.
C. c) It initially decreases with increase in pH value.
D. d) It initially increases with increase in temperature and then decreases

Answer

C

Explanation

Every enzyme posses an optimum pH value where it is most effective. Most enzymes show maximum activity in a pH rang of about `6.0` to `7.5` i.e, near neutra pH. Some digestive enzymes have their optimum pH in the acidic or alkaline range. E.g., pepsin of gastic juice has its optimum at pH 2 (acidic) whereas typsin of pancreatic juice shows maximum activity at pH 8.8 (alkaline). A rise and fall in pH reduces enzyme activity by changing the degree of ionisation of its side chain.