Where do you find the most potential energy in the ATP molecule?

Energy is stored in the covalent bonds between phosphates, with the greatest amount of energy,in the bond between the second and third phosphate groups

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before it leaves the nucleus of a eukaryotic cell, mrna is altered in the following ways: - a cap is added to the 5' end of the mrna molecule; - a poly a tail is added to the 3' end; - introns are removed and exons are spliced together.

yes, because even though a theory has a  lot of evidence to support it, it is not always true