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Unformatted text preview: e an endergonic one • Most energy coupling in cells is mediated by ATP The Structure and Hydrolysis of ATP • ATP (adenosine triphosphate) is the cell’s energy shuale • ATP is composed of ribose (a sugar), adenine (a nitrogenous base), and three phosphate groups hydrolysis of this phosphate group drives metabolic processes in the cell Adenine Phosphate groups
alpha Ribose • The bonds between the phosphate groups of ATP’s tail can be broken by hydrolysis • Energy is released from ATP when the terminal phosphate bond is broken • This release of energy comes from the chemical change to a state of lower free energy, not from the phosphate bonds themselves ATP hydrolysis Adenosine triph...
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