From which intermediate shared by glycolysis and gluconeogenesis is glycogen produced? During glycogenolysis, the splitting of a glucose residue off of glycogen is spontaneous. During glycogenesis,...

From which intermediate shared by glycolysis and gluconeogenesis is glycogen produced? During glycogenolysis, the splitting of a glucose residue off of glycogen is spontaneous. During glycogenesis, the addition of a glucose residue to glycogen is also spontaneous. How is it possible for both processes to be spontaneous?