basic characteristics
composed of phospholipid bilayer, other lipids, embedded proteins and associated carbohydrates
what is a membrane
the primary molecule in membranes is
what is phospholipids
actively pump Na+ out and K+ into cell (Na+/K+ pump)
what is transporters
through membrane 1+ times (protein on both sides)
what is transmembrane
sugars covalently linked to proteins; short->___ long ->____
what is glycoproteins and proteoglycans (located on non-cytosolic membrane to form glycocalyx)
membrane is composed of ___ lipid sheets known as a lipid bilayer
what is 2
phospholipids have 1 head which is ____ and 2 tails which are ______
what is hydrophilic and what is hydrophobic
allows K+ to leak out of cell, influencing cell excitability (K+ leak channels)
what is ion channels
through membrane only intracellularly
what is monolayer-associated
protects and lubricates the cells (so they dont stick when they bump)
what is surface carbs
prevents molecules on either side from freely mixing
what is selective barrier
what does saturated mean
what is a single bond (unsaturated is a double bond)
link intracellular actin filaments to extracellular matrix proteins (integrins)(keep cytoskeleton in place)
what is anchors
bonded to lipids in membrane
what is lipid-link
transmembrane proteins that are specialized to bind to oligosaccharide side chains
what are lectin
inside of the cell membrane forms specialized compartments called.....
what is organelles
what is the most common phospholipid
what is phosphatidylcholine
bind extracellular receptors, causing intracellular signals (PDGF receptors cause cell to grow & divide)
what are receptors (transport signals)
linked to proteins in membrane integral proteins
what is protein attached
asymmetrical, acting as a 2D fluid, fluidity is determined by it's components
what is lipid bilayer
...the outside of the cell is called...
what is plasma membrane
exposed edges are energentically unfavorable, assembly into self sealing containers known as...
what is liposomes
catalyze production of small intracellular signals in response to extracellular signals (adenylyl cyclase)
what are enzymes
movement of proteins can be restricted by attachment to cortex or molecules out of the cell, cell junctions or diffusion barriers
what is central role in cell's shape + integrity
carbs are associated with membranes intercellular side, what is their responsibility
what is protect, lubricate cell surfaces and cell to cell signaling