Glycolysis has two parts; part one and two.
Gylcolysis one is a series of exothermic reactions. In order to start gylcolysis one you need energy (ATP). It comes
from the first reaction in gylcolysis one, called substarte level phosphorylation. In this reaction, an enzyme takes a phosphate
from one sulphate to another. It removes a phosphate to glucose and creates glucose-6-phosphate. Then the glucose-6-phosphate
is changed into fructose-6-phosohate, and is then changed into fructose-1,6-diphosphate. The fructose-1,6-diphosphate is then
rearranged to form two molecules of PGAL.
Gylcolysis Two consists of a series of exothermic reactions. After gylcolysis one, each PGAL is oxidized. The electrons
are taken up by NAD that is eventually reduced. A hydrogen ion is then attached to the NAD molecule to create NADH. The PGAL
can now take another phosphate ion from the cytosol of the cell to form PGAP(1,3-diphosphoglcerate). After PGAP is formed
two molecules of ADP remove a phosphate group from PGAP and form PGA. Here, substrate level phosphorylation creates two molecules
of ATP (one for each molecule of PGAP). The molecules of PGA are oxidized and release two water molecules and form PEP. Then
another substrate level phosphorylation happens. Two ADP molecules remove the phosphates from the PEP and form two ATP molecules.
The final product of glycolysis one and two is pyruvic acid.