BMSC 200 Module 9 || with 100% Correct Answers.

what are membrane functions? correct answers 1) separate cells from the external medium to create an intracellular environment of unique and defined composition 2) allow selective transport of substrates in and out of the cell 3) provide a location for specialized pathways and processes (energy conversion of mitochondria) 4) rapid changes in electric potential across the membranes of neurons as basis of the nervous system 5) localization of receptors to facilitate response to physiological signals 6) mediate cell-cell recognition and interaction what is the basic structural element of membranes? correct answers the lipid bilayer the type of the lipid aggregate formed depends on the ratio of? correct answers cross-sections of the polar head group and the hydrophobic tail what do fatty acids favour? correct answers micelle formation of micelles, glycerophospholipids and sphingolipids form flat bilayers lipid bilayers form membrane _____ correct answers vesiscles exposure of hydrophobic tails to water is ? correct answers energetically unfavourable flat bilayer sheets form? correct answers membrane vesicles with an internal volume basis of cells, organelles, and artificial liposomes for? correct answers drug delivery biological membranes share? correct answers fundamental properties membranes are? correct answers - impermeable to charged and polar molecules - 5-8 nm thick (two dimensional structures) - asymmetrical (each face has different composition) - fluid (fluid mosaic model) and dynamic what does fluid mean? correct answers these lipids arent covalently linked, just a hydrophilic drive what does dynamic mean? correct answers constant turn over of the components in the membranes what are membranes primarily composed of? correct answers lipids and proteins more active membranes have what? correct answers a higher ratio of protein lipids include what? correct answers phospholipids, glycosphingolipids and sterols