When Phosphoribosyl Pyrophosphate (PRPP)is Used to Form AMP from Adenine

question 36

Multiple Choice

When phosphoribosyl pyrophosphate (PRPP) is used to form AMP from adenine (as well as in numerous other cell reactions) ,the reaction is rendered irreversible because

• A)PRPP has such a high affinity for the enzyme involved.
• B)the rate of the reaction favors formation of the product(s).
• C)this reaction is thermodynamically feasible.
• D)the presence of pyrophosphatase hydrolyzes pyrophosphate formed.
• E)All of the above.