ATP is a mononucleotide in
which the base is adenine
and the sugar ribose
The ATP cycle
The covalent bond linking the second
and third phosphate groups in ATP is
unstable. This can easily broken by
hydrolysis, causing ATP to become ADP.
This is an exergonic reaction because
energy is released
A condensation reaction allows the
resynthesis of ATP from ADP. An
enzyme called ATP synthase
catalyses the formation of ATP from
ADP and a phosphate group