CellsMembraneTrasnport - Chapter 3 Cells vary in size...

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1 Chapter 3 Cells vary in size possess distinctive shapes measured in micrometers
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2 A Composite Cell hypothetical cell major parts nucleus cytoplasm cell membrane
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3 Cell Membrane outer limit of cell controls what moves in and out of cell selectively permeable phospholipid bilayer water-soluble “heads” form surfaces water-insoluble “tails” form interior permeable to lipid-soluble substances cholesterol stabilizes the membrane proteins receptors pores, channels, carriers enzymes CAMS self-markers
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4 Cell Membrane
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5 Intercellular Junctions Tight junctions close space between cells located among cells that form linings Desmosomes form “spot welds” between cells located among outer skin cells Gap junctions tubular channels between cells located in cardiac muscle cells
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6 Cell Nucleus control center of cell nuclear envelope porous double membrane separates nucleoplasm from cytoplasm nucleolus dense collection of RNA and proteins site of ribosome production chromatin fibers of DNA and proteins stores information for synthesis of proteins
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7 Cytoplasmic Organelles Endoplasmic Reticulum connected, membrane-bound sacs, canals, and vesicles transport system rough ER studded with ribosomes protein synthesis smooth ER lipid synthesis added to proteins arriving from rough ER break down of drugs Ribosomes free floating or connected to ER provide structural support
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8 Cytoplasmic Organelles Golgi apparatus stack of flattened, membranous sacs modifies, packages and delivers proteins Mitochondria membranous sacs with inner partitions generate energy Vesicles membranous sacs store substances
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9 Cytoplasmic Organelles Lysosomes enzyme-containing sacs digest worn out cell
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This note was uploaded on 12/14/2009 for the course BIO1A 0012349 taught by Professor Durkka during the Spring '09 term at École Normale Supérieure.

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CellsMembraneTrasnport - Chapter 3 Cells vary in size...

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