intro

• how do we get energy?
• functions of ATP
• structure of ATP
• why not use other energy-rich molecules directly?

hydrolysis and free energy

• why does ATP have so much free energy?
• how do the phosphate bonds break?
• how do new bonds form?
• how does energy get released?

energy coupling

• how is it able to happen?
• phosphorylation

regeneration

• how does it happen?
• ATP cycle

summary

• ATP supplies energy directly to chemical reactions in all cells
  • it is the universal energy currency in living organisms
• ATP hydrolysis results in the formation of ADP and $P_i$, and release a large amount of free energy in the process
• ATP hydrolysis can be coupled to endergonic reactions in a cell to power hundreds of reactions
  • this process is called energy coupling