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A hypothetical metabolic pathway can be diagrammed as A-->B--->C--->D,, and x, y z are the enzymes that catalyze the reactions The free energy changes for the reactions are

x= -0.2kJ/mol

y= -12.3kJ/mol

z= -1.2 kJ/mol

a) Which reaction is likely to be a major regulatory point for the pathyway? b) If your answer to 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,D increase, decrease or not be affected? Explain your answer.

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