The following image of glucose transport by GLUT1 (glucose transporter 1) shows saturation at higher glucose concentrations. Why can't glucose cross the cell membrane on its own, as indicated by this figure?

Question

GLUT1

Answer

Glucose is hydrophobic and repelled by the membrane.

Answer

Glucose requires ATP to cross the membrane.

Answer

Glucose is actively transported by ion channels.

Answer

Glucose is nonpolar and can easily diffuse through the membrane.

Answer

Glucose is too large and polar to diffuse through the lipid bilayer without assistance.

Crowdly

The following image of glucose transport by GLUT1 (glucose transporter 1) shows...

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