Figure 24

Electron micrograph of microvilli on the apical surface of an absorptive cell. The glycoproteins of the glycocalyx can be seen extending from the tips of the microvilli into the lumen. At this magnification, the relationship between the outer plasma membrane leaflet and the glycocalyx is particularly well demonstrated. Glycoproteins of the glycocalyx include terminal digestive enzymes such as dipeptidases and disaccharidases. x 100,000. (Courtesy of Dr. Ray C. Henrikson.)

integral membrane proteins outer leaflet of lipid bilayer

inner leaflet of lipid layer peripheral membrane depression left by proteins P-face protein

P-face

E-face integral membrane proteins

cytoplasm integral membrane proteins cytoplasm outer leaflet of lipid bilayer peripheral membrane depression left by proteins P-face protein

P-face

E-face integral membrane proteins inner leaflet of lipid layer

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