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35 Cards in this Set

  • Front
  • Back
Selectively permability is
some substances can cross easier than others across the membrane
Amphiphatic molecule is
phospholipid both hydrophilic and phobil regions
Fluid mosaic model is
fluid structure with various proteins embedded in or attached to a double layer of phospholipids
Membrane held by
hydrophobic interactions and is fluid not locked
Membrane remains as a fluid as
temperature decreases until is solidifies (bacon greese)
Integral proteins
penetrate hydrophobil core of lipid bilayer
Peripheral proteins are
appendages loosely bound to surface of the membrane
What dissolves in lipid bilayer?
Hydrophobic molecules dissolve
Hydrophobic core impedes
hydrophilic and polar molecules
Transport proteins are
hydrophilic substances that use their channel to tunnel through membreans
Diffusion is
tendency for molecules to spread apart into available space
Concentration gradient is
Increase/decrease in density of chemicals in substance
passive transport is
a diffusion of a substance across a biological membrane
Hypertonic is
the higher solute concentration
hypotonic is
the lower solute concentration
isotonic is
solutions are equal concentrations
Osmosis is
diffusion of h20 across a selectively permeable membrane, water moves from hypotonic to hypertonic
Osmoregulation is
Control of water balance
Turgid is
firm cell wall, healthy
Flaccid is
limp cell wall, isotonic I think
Plasmolysis is
Plasma membrane pulls away from the wall
Facilitated diffusion is
Polar/ hydrophilic molecules pass with the help of proteins, some proteins specific to what they are transporting
Aquaparins are
water channel proteins
Gated channels are
stimulus close then to pen + close
Active transport
pump a molecule against it's gradient across a membrane, takes metabolic energy
Membrane potential is
voltage across a membrane
Electrochemical gradient is
Combination of forces anion and ion
electrogenic pump is
transport protein that generates voltage across a membrane
Protein pump is
actively transports hydrogen ions out of cell
cell secretes macromolecules by fusion of veicles with plasma membrane
cell takes in macromolecules and particulate matter
cell engulfs a particle by wrapping psuedopodia around it and packaging it within a membrane enclosed sac large enough to be classified as a vacuole
cell gulps droplets of extracellular fluid into tiny vessicles
mediated endocytosis
extracellular substance that binds to receptors