encloses the cell, defines the cell boundaries, maintains the essential difference between the cytosol and the extracellular environment
nucleus, endoplasmic recticulum, golgi apparatus, mitochondra, lysosomes, peroxisomes
provides the basic structure of the membrane, serves as a relatively impermeable barrier
lipid molecules are __ of most animal cell membrane
hydrophilic and hydrophobic
most abundant membrane lipids, have a polar head group and two hydrocarbon tails
one phospholipid tail has cis double bonds
one phospholipid tail does not have double bonds
the main phospholipids in most animal cell membranes are
have three carbon glycerol backbone, two long chain fatty acids, third carbon attached to phosphate group
phosphate group heads
built from sphingosine, long acyl chain with an amino group and two hydroxyl groups at one end of the molecule
polar head group, rigid steroid ring structure, nonpolar hydrocarbon tail
sugar containing lipids, located on the non-cytosolic monolayer of the lipid bilayer, made from sphingosine, sugars addded in the lumen of golgi, cell recognition process
galactose sugar attached
5 sugars attached
six carbon cyclic ring attached
___rarely flip flop, flexion rotation occurs
lipid componets of bilayer
convert extracellular signals into intracellular signals, cytosolic side of the bilayer is negatively charged
activated by extracellular signals to cleave specific phospholipid molecules serving as signal mediators
signals next cell to phagocytose and digest the dead cells, phospholipid translocator is inactivated,
transfers phospholipids nonspecifically in both directions between the two monolayers is activated
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