AS-LEVEL AQA BIOLOGY NOTES
TOPIC 8: atp
ATP and ADP are phosphorylated nucleotides - nucleotides with phosphoryl groups attached. ATP has three phosphoryl groups and ADP has two. ATP is called the universal energy currency as it is used in energy transfer inside almost all living organisms. During its use, it becomes dephosphorylated and turned into ADP.
- Structure consists of an adenosine molecule, a ribose, 3 phosphate groups
- Hydrolysis of ATP occurs during energy-requiring reactions in cells
- Phosphate group is released - forming ADP
- ATP is re-synthesised from ADP and Pi