The Graph Shows the Rate of Catalysis Versus PH for an Enzyme-Catalyzed

question 32

Multiple Choice

The graph shows the rate of catalysis versus pH for an enzyme-catalyzed reaction.What conclusion can be made from the graph?

• A)The enzyme is completely denatured by pHs greater than 8 or less than 5.
• B)The substrate has four ionizable groups.
• C)At pH 6.2 all ionizable groups in the active site are protonated.
• D)The enzyme has an acidic and a basic amino acid in the active site.
• E)The enzyme has only one protonatable residue in the active site.

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