Gluconeogenesis

Gluconeogenesis is the production of  glucose, mainly from the end product of glycolysis, which is pyruvate. In addition, there are other precursors molecules which are involved in gluconeogenesis, suc as oxalate and amino acids.
Essentially, gluconeogenesis(glucose synthesis) in a sense may seems to be the reverse reaction of glcolysis(glucose breakdown). However, these two reactions are not completely irreversible, due to the "one-way" steps along the individual biochemical processes as well as the different catalysing enzymes involved.