A metabolic pathway proceeds according to the scheme, R rightarrow S rightarrow

Question

A metabolic pathway proceeds according to the scheme, R rightarrow S rightarrow T rightarrow U rightarrow V rightarrow W. A regulatory enzyme, X, catalyzes the first reaction in the pathway, Which of the following is most likely correct for this pathway? A) Either metabolite U or V is likely tb be a positive modulator, increasing the activity of enzyme X. B) The first product S, is probably the primary negative modulator of enzyme X, leading to feedback inhibition. C) The last product, W, is likely to be a negative modulator of enzyme X, leading to feedback inhibition. D) The last product, W, is likely to be a positive modulator, increasing the activity of enzyme X. E) The last reaction will.be catalyzed by a second regulatory enzyme.

Explanation / Answer

Option C

the last product, W, is likely to be a negative modulator of enzyme X, leading to feedback inhibition.

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