CELL MEMBRANE Proteins that stick on the surface = _____________ (either inside or outside of cell) Proteins that stick INTO membrane = ________________ (can go part way in or all the way through) PERIPHERAL INTEGRAL
<ul><li>Recognize “self” </li></ul>GLYCOPROTEINS GLYCOPROTEINS are PROTEINS with carbohydrates attached Image from: http://faculty.clintoncc.suny.edu/faculty/Michael.Gregory/files/Bio%20101/Bio%20101%20Lectures/Membranes/membrane.htm
WHAT DOES IT DO? <ul><li>Acts as a boundary </li></ul><ul><li>Controls what enters and leaves cell </li></ul>Images from: http://vilenski.org/science/safari/cellstructure/cellmembrane.html http://www.mccc.edu/~chorba/celldiagram.htm
Cell membranes MOVE! <ul><li>Molecules in cell membranes are </li></ul><ul><li>constantly moving and changing </li></ul>Click to See Fluidity Animation from: http://www.sp.uconn.edu/~terry/images/anim/fluidmem.gif
CELL MEMBRANE (PLASMA MEMBRANE) Made mainly of ____________________ and _________________ HYDROPHOBIC “tails” of phospholipids make molecules line up as LIPID ________________ with POLAR heads facing _______ & NON-POLAR tails facing ________ Proteins attached to surface (inside or outside)= _____________ Proteins stuck into membrane = ______________ (can go part way in or all the way through) <ul><li>OTHER MOLECULES: </li></ul><ul><ul><ul><li>GLYCOPROTEINS </li></ul></ul></ul><ul><ul><ul><li>(proteins with ___________attached) </li></ul></ul></ul><ul><ul><ul><li>STEROIDS (lipids) </li></ul></ul></ul>Membranes are ____________________________________ (=Semi-permeable) Allow certain molecules to pass through; but keep others out __________________ = gel-like material + organelles between nucleus and cell membrane “ recognize self” phospholipids proteins BILAYER out in Peripheral Integral sugars SELECTIVELY PERMEABLE cytoplasm
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