Glycolosis Preparatory Stage

Glycolysis Preparatory Stage
In this stage, 2 molecules of atp are used to phosphorylate a molecule of glucose. The resultant phosphorylated sugar is then split into two 3-carbon molecules.

Glucose enters the cell and is phosphorylated 000000
A molecule of atp is invested ATP
The product is glucose 6 phosphate 000000p
Enzyme
000000p (fructose 6)
ATP
p000000p (1,6 diphosphate)
enzyme
p000 000p

Next an enzyme rearranges glucose 6 phosphate to create fructose 6 phosphate
The phosphate from another atp is used to produce fructose 1,6 diphosphate
Note that 2 atp molecules have been invested up to this point

Next an enzyme splits the sugar into 2 three carbon molecules and the preparatory stage of glycolysis is completed.

2 molecules of ATP used so far. Created two 3 carbon units.