Membrane Structure

3. The cellular secretion of biological molecules by the fusion of vesicles containing them with the plasma membrane.
6. Mosaic Model The membrane modeled as a mosaic of protein molecules bobbing in a fluid bilayer of phospholipids.
10. endocytosis The movement of specific molecules into a cell by the infolding of vesicles containing proteins with receptor sites specific to the molecules being taken in
11. Proteins proteins that transport certain molecules and ions as a channel through the plasma membrane.
12. channels Open and close in response to a stimulus.
13. Branched sugar units covalently bonded to proteins in the plasma membrane.
14. A type of endocytosis in which the cell ingests extracellular fluid and its dissolved solutes.
15. A membranous sac in the cytoplasm of a eukaryotic cell.
18. A lipid made up of glycerol joined to two fatty acids and a phosphate group. Extra-cellular matrix The meshwork surrounding animal cells, consisting of glycoproteins, polysaccharides, and proteoglycans synthesized and secreted by cells.
19. Branched sugar units covalently bonded to lipids in the plasma membrane.
20. permeability A property of biological membranes that allows them to regulate the passage of substances across them.
21. channels channel proteins that transport ions.

1. pump electrogenic pump which actively transports protons.
2. proteins Proteins that are not imbedded in the lipid bilayer; loosely bound to the surface of the membrane.
3. Cellular uptake of biological molecules and particulate matter via formation of vesicles from the plasma membrane.
4. Proteins proteins that penetrate the hydrophobic interior of the lipid bilayer.
5. A steroid that forms an essential component of animal cell membranes and acts as a precursor molecule for the synthesis of other biologically important steroids, such as many hormones.
7. Channel proteins that transport water molecules through the membrane.
8. pump transport system the exchanges sodium and potassium across the plasma membrane.
9. A type of endocytosis in which large particulate substances or small organisms are taken up by a cell.
16. Pump An active transport protein that generates voltage across a membrane while pumping ions.
17. Having both a hydrophilic region and a hydrophobic region.