Enzyme X exhibits maximum activity at pH=6.9. X shows a fairly sharp decrease in its activity when the pH goes much lower than 6.4. One likely interpretation of this pH activity is that:

Bio-Chemistry (M.Phil./Ph.D.) 2019 Panjab University Entrance Exam With Answers

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18.

A: A Glu residue on the enzyme is involved in the reaction

B: A His residue on the enzyme is involved in the reaction

C: The enzyme has a metallic cofactor

D: The enzyme is found in gastric secretions

The answer is: B

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