1) ATP hydrolysis provides the energy for this reaction: X + Y + ATP <----> Z +
ID: 171819 • Letter: 1
Question
1) ATP hydrolysis provides the energy for this reaction: X + Y + ATP <----> Z + ADP + Pi , which would otherwise be endergonic. The mechanism by which this occurs is that compound X is phosphorylated using the phosphate group from ATP. dephosphorylation of X, which itself is exergonic, makes it possible for X and Y to combine to form Z. In this scheme X-P can be considered the transition state. The entire reaction mechanism is as follows:
X + Y + ATP <---> X-P + Y + ADP <---> Z + ADP + Pi
Is ATP an enzyme for this reaction?
(a)Yes, because it alters the transition state
(b)Yes, because it increases the rate of the reaction
(c)Yes, because it provides energy to get over the activation energy barrier
(d)No, because it is irreversibly altered by the reaction
(e)No, because it does not alter the transition state
2) Which of the following may be true for an enzyme?
(a)It may chemically interact with its substrate.
(b)It may be permanently altered by the reaction.
(c)It may provide the energy for an endergonic reaction.
(d)All of the above
2) Which of the following may be true for an enzyme?
(a)It may chemically interact with its substrate.
(b)It may be permanently altered by the reaction.
(c)It may provide the energy for an endergonic reaction.
(d)All of the above
Explanation / Answer
1.Correct answer would be:(d)No, because it is irreversibly altered by the reaction
Reason:ATP is not an enzyme.
2.Correct answer would be:(a)It may chemically interact with its substrate.
Reason:Enzymes react with the substrates chemically at the active site to give products.
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