ch 3 ppt - Basic,living,structuralandfunctionalunit...

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Chapter 3 The Cellular Level of  Organization Basic, living, structural and functional unit  of the body compartmentalization of chemical reactions  within specialized structures use genetic material to direct cell activities Cytology  = study of cellular structure Cell physiology  = study of cellular  function 3-1
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Generalized Cell Structures Plasma membrane   = cell membrane Nucleus  = genetic material of cell Cytoplasm  = everything between the  membrane and the nucleus cytosol  = intracellular fluid organelles  = subcellular structures with  specific functions 3-2
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The Typical Cell Not all cells contain all of these organelles. 3-3
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Plasma Membrane Flexible but sturdy barrier  that surround  cytoplasm of cell Fluid mosaic model  describes its structure “sea of lipids in which proteins float like  icebergs” held together by hydrogen bonds lipid  is barrier to entry or exit of polar  substances proteins  are “gatekeepers” -- regulate traffic 50 lipid molecules for each protein  3-4
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Lipid Bilayer of the Cell  Membrane Two back-to-back layers of 3 types of lipid molecules Cholesterol and glycolipids  scattered among a  double row of  phospholipid molecules 3-5
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Glycolipids within the Cell  Membrane Comprises 5% of the lipids of the cell  membrane Carbohydrate groups form a polar head only  on the side of the membrane facing the  3-6
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Membrane Proteins 3-7 Integral versus Peripheral Proteins
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Integral Vs Peripheral proteins Integral / Transmembrane proteins  are  deeply embedded in the plasma  membrane and most of them span thru the  lipid bilayer. Peripheral proteins  are loosely attached  to the lipid bilayer of either the outside or  the inside of the cell membrane. 3-8
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Functions of Membrane Proteins  Formation of  Channel passageway to allow  specific substance to  pass through Transporter  Proteins bind a specific  substance, change  across membrane Receptor Proteins cellular recognition  3-9
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Functions of Membrane Proteins Cell Identity Marker allow cell to recognize  other similar cells   Linker anchor proteins in cell  membrane or to other  cells allow cell movement Act as Enzyme speed up reactions 3-10
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  Gradients Across Membrane Concentration  gradient Electrical gradient 3-11
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Transport Across the Plasma  Membrane Substances cross membranes by a variety of  processes:   mediated transport  moves materials with the help of a transporter protein
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This note was uploaded on 03/24/2010 for the course BIO 2401 taught by Professor Maurstad during the Spring '08 term at San Jacinto.

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ch 3 ppt - Basic,living,structuralandfunctionalunit...

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