BIOL 1001 Lecture 4: CH 4 Outline
1 Dec 2017
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Document Summary
Cause by defective protein channel (cftr) in epithelial cells. Thick mucus clogs airways and ducts throughout body. Proteins: most phospholipids and some proteins can drift through membrane, membrane proteins, membrane experiments, membrane proteins, transport proteins: regulate movement through membrane. Carrier proteins: receptor proteins: trigger cellular response when specific molecules attach, recognition proteins: id tags and attachments sites, membrane experiments, membrane crossing mechanisms. Hybrid human-mouse cell shows some proteins drift within membrane. Passive transport: movement down concentration gradient; no energy required. Facilitated diffusion: goes across membrane w/ help from proteins: osmosis: water moves through differentially permeable membrane, means the number of molecules or ions in one region is different than the number. In the absence of other forces, a substance moves from a region where it is more concentrated to one where it"s less concentrated- down gradient. The net movement of like molecules or ions down a concentration gradient.
