Enzyme X Exhibits Maximum Activity at PH = 6

question 36

Multiple Choice

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:

• 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.
• E) the reaction relies on specific acid-base catalysis.

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