It seems like there are several ideas mixed up in the descriptions you've provided about the ATP cycle. Here's a clarification of the ATP cycle:
The ATP cycle involves the following process:
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Phosphorylation of ADP to form ATP: Energy is used to add a phosphate group to ADP (adenosine diphosphate) to form ATP (adenosine triphosphate), which is the energy-carrying molecule in cells.
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Hydrolysis of ATP to release energy: When energy is needed by the cell, ATP is broken down into ADP and an inorganic phosphate (Pi) through a process called hydrolysis. This reaction releases energy that can be used for various cellular functions.
So, the closest correct description could be a combination of points from your options, focusing on the idea that ATP is produced from ADP, and energy is released when ATP is hydrolyzed back to ADP.
To correct the options:
- Phosphorylating ADP to form ATP and removing a phosphate from ATP to form ADP in order to store and release energy.
This would be the most accurate representation of the ATP cycle.