ATP is the molecule that supplies the energy needed to join glucose molecules together to form a molecule of glycogen.
Explanation:
ATP is the energy currency of cells. It is used to power all non-spontaneous biochemical reactions in the body including the conversion of glucose to glycogen.
Glycogen has a higher Gibbs free energy than glucose (because it lowers entropy) meaning you need energy to convert glucose to glycogen. This reaction does not occur spontaneously because of it akin to ‘climbing a hill’. ATP is involved in the condensation reaction of joining glucose molecules together into glycogen via glycosidic bonds.
