Why doesn’t the sugar cross the cell membrane and diffuse the way the way does?

Also, the cell membrane is impermeable to many of the larger substances needed by the cells. Sugars, amino acids, etc. cannot simply diffuse from one side of the membrane to the other. Cells, therefore, transport these needed molecules across the membrane using special carrier proteins.

Explanation:

Also, the cell membrane is impermeable to many of the larger substances needed by the cells. Sugars, amino acids, etc. cannot simply diffuse from one side of the membrane to the other. Cells, therefore, transport these needed molecules across the membrane using special carrier proteins.

Although glucose can be more concentrated outside of a cell, it cannot cross the lipid bilayer via simple diffusion because it is both large and polar. To resolve this, a specialized carrier protein called theglucose transporter will transferglucose molecules into the cell to facilitate its inward diffusion.

Explanation:

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