Why is it efficient for cells to keep only a small
supply of atp on hand?

Even though ATP is a great molecule for transferring energy, it is not a good one for storing large amounts of energy over the long term. ... Therefore, it is more efficient for cells to keep only a small supply of ATP on hand. Cells can regenerate ATP from ADP as needed by using the energy in foods like glucose.

Explanation:

Got this from google but I hope it helps :))

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