Question

Compare the storage capacity of ATP and glucose. How does the cell use each of these molecules to store energy?

Answer 1

The storage capacity of ATP is very limited, I like to repesient the situation with a flow diagram, if you imagine we got a source, a storage, and a drain we can set up a model of the ATP storage capacity like the following:

Take note that the drain and the source is almost equal in rate, leaving the ATP concentration unchanged, in most cells this concentration will be very low. ATP is therefor, from our model fast used energy, which is not made for storage, but made to be used!

Glucose got the capability to be transferred into multiple molecules. 2 notable storage molecules glucose can be transformed into are among others glycogen and fats. Which can serve for long time storage (you don't lose weight automatically, you gotta do something for it ;) )
Yey glucose left to it self, is not a good storage molecule, as it will feed the many pathways as glucose is a so easy metabolized molecule.