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physiology notes
lecture unit one - membrane physiology
| Question | Answer |
|---|---|
| a model of the general structure of the plasma membrane consists of a phospholipid bilayer embedded with proteins | fluid mosaic model |
| plasma membrane is about 50% ___ and 50% ___ | protein and lipid |
| having both polar and non polar parts are called | amphipathic |
| many proteins and lipids are | amphipathic |
| phospholipids of the membrane lipids form a bilayer (a head that is__ and tails that are ___) | head is hydrophilic and tails are hydrophobic |
| ___ is a stabilizing component of the lipid membrane | cholesterol |
| isolation of cellular contents and a source of local chemical mediatiors is a function of | membrane lipids |
| structure of the membrane proteins most are __ some are __ shaped | globular and alpha helical |
| membrane proteins location: 70% are __ and 30% are ___ | integral (intrinsic) and peripheral (extrinsic) |
| membrane transport, cellula communication and enqumatic control are functions of | the membrane proteins |
| a fuction of membrane proteins that acts as receptors for regulatory molecules is called | cellular communication |
| cellular recognition of membrane proteins is a function of | cellular communication |
| the plasma membrane is ___ permeable or ____-permeable | selectively permeable or semi-permeable |
| what is permitted by the plasma membrane | small lipid soluble molecules |
| what 3 things are not permitted through the plasma membrane | polar molecules, inorganic molecules (lipid insoluble) and charged atoms/molecules |
| water filled pores that extend across the membrane allowing the passive movement of solute across the membrace | channel proteins |
| __ allow movement of ions or small polar molecules via simple diffusion | no regulated channels (pores) |
| ___ regulate the movement of ions or small polar molecules (movement via simple diffusion) | regulated channels (gates) |
| 2 types of regulated channels are | chemical regulated and voltage regulated channels |
| bind specific solutes on one side of the membrane and transfer them to the other | carrier proteins |
| unstable and change shape, and made up of at least 2 molecules are characteristics of | carrier proteins |
| binding may trigger a conformational change that allows exposure of bound substance to cell's interior are | carrier proteins |
Created by:
JohnPink