AP Biologyeasymcq1 pt
ATP drives endergonic reactions by
A.coupling — its energy release is paired with the energy-requiring step
B.absorbing energy from the reaction
C.acting as an enzyme
D.lowering the cell's temperature
Explanation
Core Concept
Cells drive endergonic processes by coupling them to sufficiently exergonic reactions such as ATP hydrolysis so the total free-energy change is favorable. Phosphorylation of a substrate is one common coupling mechanism, but ATP can also power conformational and mechanical changes. Coupling—not universal phosphate transfer to the reactant—is the general principle.
Correct Answer
Acoupling — its energy release is paired with the energy-requiring step
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