A. ATP consumes energy from another metabolic reaction.
B. ADP often transfers a phosphate to the reactant. C. The metabolic reaction requires energy from ATP.
D. ATP gains a phosphate group.
E. ADP is used up in the metabolic reaction.
C. ATP hydrolysis is often the coupling reaction of choice when it comes to providing energy for otherwise unfavorable reactions.
Definition of coupled reaction :
A chemical reaction having a common intermediate in which energy is transfered from one side of the reaction to the other.
The formation of ATP is endergonic and is coupled to the dissipation of a proton gradient.
ATP + glucose -> ADP + glucose-1-phosphate and glucose-1-phosphate + fructose -> sucrose + phosphate
– a molecule of sucrose is synthesized from glucose and fructose at the expense of the energy stored in ATP and transfered by glucose-1-phosphate