2_15_07 - Enzymatic activity • Thylacoids in chlorplasts...

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February 15, 2007 Biology 130 Membranes Today: Review structure and function Cellular transport Diffusion Osmosis Mediated transport Passive and active Cholesterol is only found in animal cells These molecules are ampipathic, they can be both hydrophobic and hydrophilic Cells can manipulate membrane fluidity. More unsaturation causes more fluid membrane. Saturation means less movement in the membrane. Changes common in marine organisms. Phospholipid bilayer – function is compartmentalization o The membrane is selectively permeable. Only a few select molecules can get through. Small size, non-polar. Oxygen, carbon dioxide. Water requires proteins to mediate transport across the membrane. Uses aquaporins. Anything charged needs to be aided. Also large polar, water soluble materials need help. o Integral proteins are imbedded in the membrane. There are special transport mechanisms Ion channels – gated or non gated Transport proteins -
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Unformatted text preview: Enzymatic activity • Thylacoids in chlorplasts • Christae in mitochondria • Part of the Electron Transport Chain Signal transduction • Receptors • Neurotransmitter receptors Cell-Cell Recognition • MHC proteins (major histocompatibility complex) allow your cells to recognize each other. Often glycoproteins Intrercellular joining • Junctions between cells. Adhesive. Cytoplasmic fibers go from one cell to the other. • Tight junctions – spot welds between the tissue so things can’t leak out • Gap junctions – result in electrical connections between cells – intercalated discs in cardiac muscles • Plasmodesmata – only in plant cells. Cytoplasm moves from one cell to another. Cells become one big network. • Attachment – connects the cytoskeleton to the extracellular matrix o Prephrephrial proteins. Actin or fibronectins of the extracellular matrix....
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2_15_07 - Enzymatic activity • Thylacoids in chlorplasts...

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