On the basis of the two reactions below, decide which of the following statements are true and which are false. If a statement is false, explain why it is false
1: ATP + Y -> Y-P + ADP ?G = –100 kcal/mole
2: Y-P + A -> B ?G = 50 kcal/mole
A. Reaction 1 is favorable because of the large negative ?G associated with the hydrolysis of ATP.
B. Reaction 2 is an example of an unfavorable reaction.
C. Reactions 1 and 2 are coupled reactions, and when they take place together, reaction 2 will proceed in the forward direction.
D. Reaction 2 can be used to drive reaction 1 in the reverse direction.
A. True.
B. True.
C. True.
D. False. This is false for two reasons: (1) reaction 2 is unfavorable, as indicated by the positive free-energy change associated with the reaction; (2) the reverse reaction, although possibly more favorable, will yield the product for reaction 1, not reactants to help drive it forward.
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