1. ATP ADENOSINE TRIPHOSPHATE It is the universal immediate source of energy in all living things. Adenine – Ribose – P ~ P ~ P AdenosineTriphosphate ~~ High energy bonds are shown with wavy line.

2. Hydrolysis of ATP ATP + H 2 O ADP + P i + Energy (7,3 kcal/mol) enzyme  When the third phosphate in ATP is removed and bonded to another compound, it transfers its energy to the other compound. This transfer of energy is called phosphorylation.  In some processes, ADP’s second phosphate is used as a source of energy. Ex: during polypeptide synthesis ATP + H 2 O AMP + 2 Pi + Energy

4. ADP – ATP Cycle ATP ADP Chemical energy for life used in PiPi PiPi Energy gained by Cellular respiration  Anaerobic  Aerobic  Biosynthesis  Movement  Active transport of materials  Muscle contraction  Transmission of nerve impulse  Bioluminescence