D. Used ATP becomes ADP, which then is cycled back through the system to add a extra Phosphate group, which then turns it back into ATP. It gives off that Phosphate group as energy to a part of the cell then cycles again. ATP does not become 'waste' when it is used and can be reused.
The statement that is NOT true about ATP is D, which claims that used ATP is discarded by the cell as waste. In reality, used ATP is recycled back into ADP and then recharged to ATP. ATP plays a critical role in energy transfer within cells and is not wasted.
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