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Biology
Cell Biology (cytology)

How do glucose molecules move into the cell?

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March 09, 2009 9:52PM

Glucose molecules move through the cell through diffusion. Knowing that the cell membrane is semipermiable, smaller, more hydrophobic molecules diffuse more easily than others across the membrane. O2 and CO2 used during respiration apply to this group. Uncharged polar groups can diffuse if they are small enough. Large, non-polar molecules can also diffuse. Since glucose molecules are approximately 180 Daltons, they take quite a bit longer to diffuse into the cell than water molecules do (who have a MW of 18 D).