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Fructose is, as the name suggests, the main sugar in fruit. In the human body, fructose is the primary sugar supplying
sperm and
adipose cells.
The first step involves the enzyme
Fructokinase, which phosphorylates fructose into
Fructose-1-phostphate. As in the glucose pathway, phosphorylation prevents the free movement of fructose through the
plasma membrane, ensuring that it remain in the cell.