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Step 1: The first step in glycolysis
involves the addition of a phosphate group to the glucose to form
glucose-6-phosphate. This type of reaction is described as a phosphorylization.
The enzyme that catalyzes this reaction is called hexokinase. The
molecule is called 6-phosphate because the phosphate is bonded to
the 6th carbon. If you want to see the structure of phosphate, mouse
over the graphic. 
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