Refer to the Table Below

question 240

Multiple Choice

Refer to the table below. The enzyme alcohol dehydrogenase was purified from yeast cells.It was then dialyzed against a buffer solution, which means that it was placed inside a bag consisting of a semipermeable membrane that allowed small molecules and ions to pass through, but not the enzyme.The enzyme was removed from the dialysis bag, incubated with the compound N-ethylmaleimide, and then dialyzed a second time.At each step, the enzyme's catalytic activity was measured and expressed as a percentage of its original activity shown in the table.Which statement expresses a valid conclusion that can be made based on these results?

• A) N-ethylmaleimide is a competitive inhibitor of alcohol dehydrogenase.
• B) N-ethylmaleimide is a reversible inhibitor of alcohol dehydrogenase.
• C) N-ethylmaleimide is an activator of alcohol dehydrogenase.
• D) N-ethylmaleimide is a noncompetitive inhibitor of alcohol dehydrogenase.
• E) N-ethylmaleimide is an irreversible inhibitor of alcohol dehydrogenase.

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