You've discovered a novel biosynthetic pathway that makes the molecule caffeine.  The pathway can be allosterically inhibited.  Which of the following is mostly likely true.

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
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COFFEE COFFEE BUZZ BUZZ!!! You've discovered a novel biosynthetic pathway that makes the molecule caffeine.  The pathway can be allosterically inhibited.  Which of the following is mostly likely true.

Select one:
a.
caffeine contains an allosteric site
b.
caffeine binds to the first enzyme in the pathway
c.
caffeine can be inhibited by its active site
d.
the last enzyme inhibits the first enzyme in the pathway
e.
the first enzyme promotes the degradation of the last enzyme in the pathway
Expert Solution
Metabolic pathway

In biochemistry, a metabolic pathway is series of enzyme catalysed reaction where product of one reaction acts as a substrate for next reactions. The starting biomolecule is called a precursor and the product from the last reaction is called the product. Anything inbetween is a pathway intermediate. The precursor, intermediates and product are together refered to as metabolites. For example, glycolysis is metabolic pathway by which glucose is converted to pyruvate by a series of 10 enzymatically catalysed reactions.

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