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cellbio exam 2 1

membranes

TermDefinition
tight junctions seals epithelial cells together
transmembrane proteins claudins from one cell bind to claudins on neighbor
desmosomes anchor cells together, tensile strength
cadherins bind to neighbor cadherins
plaque protein plate inside cell membrane
intermediate filaments extend from plaque into cytoskeleton
gap junctions animal cells, channels let stuff into cell
connexons connect to neighbor connexons to form continuous pore
plasmodesmata phospholipid bilayer channels between cells
lipid bilayer sheet flat 2-layered sheet
lipid bilayer sphere vesicles, hollow in the middle
cholesterol sit between phospholipids and adjust how tightly packed
integral proteins channels/carriers for active transport
gated channel protein embedded in bilayer, switched between open/closed, no ATP used
peripheral proteins loosely attached to membrane surface
carbs attach to glycolipids/glycoproteins outside cell
passive transport no energy required, diffusion
diffusion movement across membrane from high conc to low conc. only hydrophobic things let thru
facilitated diffusion membrane protein moves things against conc gradient
osmosis diffusion of water across semi-permeable membrane
hypotonic water moves into cell, swell/burst
isotonic equal conc inside/outside cell
hypertonic water moves out of cell, shrivel
active transport requires energy, pump against flow of diffusion
carrier proteins put molecules in hydrophillic pocket and move across membrane
sodium-potassium pump kick out 3 Na and let in 2 K. pos charge outside neg charge inside
secondary active transport use energy of ion gradient to move other molecules. Na wants to come in, glucose comes in too
Created by: user-1862257
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