Lecture 2 Flashcards
functions of cell membranes
- physical isolation
- regulation of exchange with environment (semi-perm)
- communication between cell and environ.
- structural support
Cell membrane composed of…
lipid, protein, and small amount of carbs
T/F, Cell membranes are all created equally
F
The more metabolically active the membrane is the more….. it contains
protein
What 3 types of amphipathic lipids are found in cell membranes?
- phospholipids
- sphingolipids
- cholesterol
phospholipids
major lipid
sphingolipids
lipid rafts
cholesterol
increase viscosity and decreases permeability
extracellular surface of cell membrane contains…
glycoproteins and glycolipids
intergral proteins roles
- membrane receptors
- cell adhesion molecules
- transmember movement
- enzymes
- mediators of intracellular signalling
peripheral proteins role
- participate in intracellular signalling
- form submembraneous cytoskeleton
peripheral proteins attache to…
loosely to phospholipid head of intergral proteins
transmembrane proteins
integral proteins
lipid anchored proteins
associated with sphingolipids and anchor with sugar-phosphate chain
lipid anchored proteins and lipid rafts have…
high cholesterol content - therefore, more viscous regions
