Answered: ABC2D z .C- X -0.2 kJ • mol- Y -12.3…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Question

A certain metabolic pathway can be diagrammed as (see pic1), where A, B, C, and D are the intermediates, and X, Y, and Z are the enzymes that catalyze the reactions. The physiological free energy changes for the reactions are (see pic.2). Solve, (a) Which reaction is likely to be a major regulatory point for the pathway? (b) If your answer in Part a was in fact the case, in the presence of an inhibitor that blocks the activity of enzyme Z, would the concentrations of A, B, C, and D increase, decrease, or not be aff ected?

X -0.2 kJ • mol-
Y -12.3 kJ • mol-1
Z -1.2 kJ • mol-

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