A PH Versus Rate Curve with an Inflection Point at PH~4

question 4

Multiple Choice

A pH versus rate curve with an inflection point at pH~4 suggests the involvement of a(n) ________ in the catalytic step.

• A)proton abstraction that requires a metal ion in close proximity
• B)proton transfer with a pK close to 4
• C)proton donation that is mediated by a coenzyme
• D)free proton surrounded by a hydrophobic environment
• E)redox cofactor

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