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hellosavannah hellosavannah
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7 years ago
what is the answer to this
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wrote...
7 years ago
because ATP is produced within the cell so there is no need of extra energy provider from the outside.
DLS
wrote...
7 years ago Edited: 7 years ago, DLS
ATP is a molecule that "stores" energy.  PPi is pyrophosphate.  PPi is cleaved from ATP to yield AMP, and this cleavage releases a lot of energy.  So much energy is released that it actually drives chemical reactions forward, and these reactions are irreversible.  To drive a reaction in the direction opposite of the PPi-driven reaction, energy must be inputted.
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