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Figure 5.11 A Carrier Protein Facilitates Diffusion Carrier proteins allow glucose to enter a cell at a faster rate than would be possible by simple diffusion across the membrane barrier. Glucose Outside of cell Glucose carrier protein Inside of cell Figure 5.11 A Carrier Protein Facilitates Diffusion The carrier protein has a glucose binding site. Glucose Outside of cell Inside of cell Figure 5.11 A Carrier Protein Facilitates Diffusion Glucose binds to the protein... Glucose Outside of cell Inside of cell Figure 5.11 A Carrier Protein Facilitates Diffusion Outside of cell Inside of cell Figure 5.11 A Carrier Protein Facilitates Diffusion ...which then changes its shape... Outside of cell Inside of cell Figure 5.11 A Carrier Protein Facilitates Diffusion Outside of cell Inside of cell ...releasing the glucose. Figure 5.11 A Carrier Protein Facilitates Diffusion The carrier protein then goes back to its original shape, ready for another glucose. Outside of cell Inside of cell