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Unformatted text preview: exergonic reactions and those that require an input of energy are called endergonic reactions. Endergonic reactions do not occur spontaneously; energy must be supplied to drive the reaction. ATP is continually produced and consumed as illustrated below. Formation of ATP Phosphorylation refers to the chemical reactions that make ATP by adding P i to ADP: ADP + P i + energy ATP + H 2 O Phosphorylation occurs by two different kinds of reactions discussed below....
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