Many metabolic pathways are ultimately concerned with ATP; either with the generation of ATP, or with the requirement of ATP for that pathway to function. Why is ATP so important to metabolism?
A. Hydrolysis of the bond between adenine and ribose in ATP is commonly used to release energy that can be used to drive other cellular reactions
B. ATP is a protein that serves as the energy currency of cells
C. Hydrolysis of ATP is used to drive exergonic reactions
D. The phosphate groups of ATP are held together by unstable bonds that can be broken to release energy
Answer: D
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