We can fill in the boxes to show the complete formation and breakdown cycle of ATP as follows:
1. ATP contains 3 phosphate groups.
2. One phosphate group is released.
3. ADP contains two phosphate groups.
4. ADP adds one phosphate group to become ATP.
How ATP is formed
ATP can be formed through substrate-level phosphorylation. ] This process involves transferring a phosphate group directly from another molecule, the substrate to ADP, creating ATP. This process is much less efficient than cellular respiration but can be used in situations where oxygen is limited.
The process of forming ATP involves adding a phosphate group to ADP and the energy stored in the phosphate bonds of ATP fuels various cellular activities.