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chapters 5&6

Biology

QuestionAnswer
what is a different name for a cell membrane plasma membrane
phospholipid bilayer is made up of...? 2 layers of phospholipids
what are components of the plasma membrane? 1.) phospholipid bilayer 2) transmembrane proteins 3) interior membrane 4) cell surface markers
what are cell membrane interior proteins? inside bilayer linked to cytoskeleton help give cell its shape
what are plasma membrane cell surface markers? outside bilayer ECM glycoproteins and glycolipids that serve to identify the cell
what does the phospholipid bilayer allow? allows hydrophobic non-polar molecules to pass through
can hydrophilic molecules pass through a phospholipid bilayer? ONLY IF very small
what is squished in between the hydrophobic tails of phospholipid bilayer? cholesterol molecules
what do cholesterol molecule do in the phospholipid bilayer? they decrease the mobility of the phospholipids to increase the strength of the cell membrane
explain transmembrane proteins of the phospholipid bilayer embedded in bilayer often go all the way through
types of transmembrane proteins transporter, enzyme and cell surface receptor
what do holes formed by pores do? allow hydrophilic molecules to pass through
what do aquaporins allow? water in and out of cells
explain passive processes: cell does NOT have to use its own energy(ATP) to move molecules through the membrane
explain Active processes: cell DOES use its own energy(ATP) to move molecules through the membrane
what are passive processes always in the form of? diffusion
explain diffusion: movement of molecules from high concentration to low concentration
explain simple/direct diffusion diffusion of hydrophobic non polar molecules directly through phospholipid bilayer
explain facilitated diffusion diffusion of molecules through the plasma membrane using specific tansmembrane proteins that act as channels
explain osmosis diffusion of water ONLY
explain selective permability cells allow only certain molecules to go through them
how do cells achieve permeability? by determining what they want to makeup and make a channel/carrier for it
explain solute stuff you put in solvent
explain solvent what you put solute in
explain hydrastatic pressure the pressure the water INSIDE the cell put on the cell membrane
explain somatic pressure opposite force needed to stop water from entering the cell by osmosis
explain tonicity refers to what osmosis and the pressure it generates does to the cell
isotonic solution outside cell has the same salute as inside the cell (doesn't gain or lose)
hypertonic solution outside the cell is higher than the solute inside the cell (cell will shrink)
Hypotonic Solution outside the cell is lower (cell will grow or possibly burst)
what are 3 types of tonicity hypertonic hypotonic and isotonic
antiporter transports 2 types of molecules going opposite directions
uniporter transports just 1 type of molecule
symporter transports 2 different types of molecules going in the same direction
phagocytosis cell eats other cell
pinocytosis cell drinking solutes
endocytosis plasma membrane moves to take in large molecules particles or even cells
explain receptor-mediated endocytosis receptors decide what the cell needs
explain exocytosis proteins or other large molecules are packed in a vesicle for export out of the cell
Created by: hiatt02