Phosphorylation and ATP

Biology Unit 4

Phosphorylation and ATP

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Biology Unit 4
Revision Notes
Topic 5: On the wild side
5. Describe how phosphorylation of ADP requires
energy and how hydrolysis of ATP provides an
immediate supply of energy for biological
processes.
Phosphorylation is the reaction by which ADP ATP. This is an endothermic reaction as
energy is required and a bond is formed. The energy required comes from the breakdown of
glucose.
When energy is needed, the third phosphate bond of ATP can be broken by hydrolysis
reaction. This is catalysed by ATPase. ATPADP + Pi. This provides an immediate supply of
energy for biological processes.
Text Book: p. 10-11

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