When the DNA is extracted, the function of protease K is to degrade the membrane protein, degrade the protein bound to the DNA so that free the DNA fully.

The<br/>isotype of Ig refers to:() A: the<br/>nature of Fc region. B: the<br/>amino acid sequence of its CD C: Its allelic form. D: whether<br/>it is membrane bound or secreted. E: The accessory molecules associate with it.

Where can pericyte be found？ A: Between the small artery endothelium and basement membrane B: Between the arteriole endothelium and basement membrane C: Between the capillary endothelium and basement membrane D: Outside the capillary basement membrane E: Between the lymphatic capillary endothelium and basement membrane

Filtration membrane

biological membrane

对比外在膜蛋白(extrinsic membrane protein)与内在膜蛋白(intrinsic membrane protein)

The myelin sheath of the peripheral nerve consists of A: Schwann cell membrane and cytoplasm B: only Schwann cell cytoplasm C: multiple layers of Schwann cell membrane D: only the lipid of Schwann cell membrane E: Schwann cell membrane and basal lamina

Glycolipids and glycoproteins are especially abundant in the‏ A: nucleus. B: mitochondrial inner membrane C: cytosol D: plasma membrane

对比膜脂的不对称性(membrane lipid asymmetric)与膜蛋白的不对称性( membrane protein asymmetric)

英译中（Translate）：semipermeable membrane（）