Chapter 7 - Cellular Membrane & Transport Notes

Chapter 7 - Cellular Membrane & Transport Notes -...

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Chapter 7 Membrane structure and function PLASMA MEMBRANE - surrounds ALL cells •  Made of  PROTEIN and PHOSPHOLIPIDS     PHOSPHOLIPIDS  = AMPHIPATHIC = Have both philic and phobic regions  • Form a  BILAYER  with polar heads out/phobic tails in FLUID MOSAIC MODEL • Current model for  animal plasma membrane  •  Held together by weak phobic interactions        that make membrane fluid  • Components can move laterally FLUIDITY of MEMBRANES • Different species have different FATTY ACID tails in their phospholipids •  UNSATURATED FATTY ACIDS  make “kinks” so phospholipids can’t pack as close together         (remain fluid @ colder temps)  CHOLESTEROL (in animal cells only)     makes membranes less fluid at higher temps (keep phospholipids from moving around)     makes membranes more fluid at lower temps (keep phospholipids from packing closely together)     MEMBRANE PROTEINS     ~  PERIPHERAL PROTEINS -loosely bound to surface     ~  INTEGRAL PROTEINS-  embedded in membrane         •  TRANSMEMBRANE  PROTEINS- span entire membrane OTHER MEMBRANE COMPONENTS CARBOHYDRATES (Ex: attached to  GLYCOPROTEINS )     ~ important in cell-cell recognition/immune system function and tissue development/differentiation         EX; important in blood transfusions/organ transplants/recognition of invaders by immune system FUNCTION OF PHOSPHOLIPIDS •   phospholipid tails provide phobic barrier     • separate cell from liquid environment SELECTIVELY PERMEABLE - due to hydrophobic/hydrophilic arrangement of phospholipids
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Chapter 7 - Cellular Membrane & Transport Notes -...

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