上游充通大兽 SHANGHAI JIAO TONG UNIVERSITY 脂质双层的两个对应的分 Carbohydrate group 子层称为小叶(leaflet) of glycoprotein Extracellular Carbohydrate group surface of of glycolipid membrane Membrane splits into layers in freeze-fracture electron microscopy. Cholesterol Proteins Intracellular surface of membrane Lipid tails form the interior Cholesterol molecules layer of the membrane. insert themselves into the lipid layer. Phospholipid heads face the aqueous intracellular and extracellular compartments. 典型的生物双层膜（注意糖脂和胆固醇在质膜中的排布方式)典型的生物双层膜（注意糖脂和胆固醇在质膜中的排布方式）。 脂质双层的两个对应的分 子层称为小叶（leaflet）