Glucose Transport and Phosphorylation

Carbohydrate metabolism begins with the movement of glucose through cell membranes. In the interior of a cell, glucose reacts with ATP to form glucose 6-phosphate, which cannot move back across the cell membrane. This step, named glucose phosphorylation, prepares glucose for further metabolic reactions. Phosphorylation is the process of adding a phosphate group to a molecule. Depending on their energy needs of the moment, cells either catabolize (break apart) or anabolize (bind together) glucose 6-phosphate.

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