Lecture 3 - Cells (1) - Isotonic solution Hypertonic...

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Cell Structure and Function
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Cell Theory
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Characteristics of All Cells
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Cells are very small 1 m 0.1 nm 10 m 0.1 m 1 cm 1 mm 100 µm 10 µ m 1 µ m 100 nm 10 nm 1 nm Length of some nerve and muscle cells Chicken egg Frog egg Most plant and Animal cells Smallest bacteria Viruses Ribosomes Proteins Lipids Small molecules Atoms Nucleus Most bacteria Mitochondrion Unaided eye Light Microscope Electron microscope Human height Measurements 1 centimeter (cm) = 10 - 2 meter (m) = 0.4 inch 1 millimeter (mm) = 10 –3 m 1 micrometer (µm) = 10 –3 mm = 10 –6 m 1 nanometer (nm) = 10 –3 μ m = 10 –9 m
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Cells must obtain energy and nutrients
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Cells contain DNA
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Cells contain cytoplasm
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Cells contain ribosomes
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Cells are bound by plasma membrane
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Plasma Membrane Structure Function
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Movement across plasma membrane Plasma membrane is selectively permeable Passive transport Active transport Bulk transport
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Movement across plasma membrane: Passive Transport Simple diffusion Facilitated diffusion Osmosis
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Movement across plasma membrane: Passive Transport Diffusion
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Movement across plasma membrane: Passive Transport Simple diffusion
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Movement across plasma membrane: Passive Transport Facilitated diffusion
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Facilitated Diffusion Figure 7.15 EXTRACELLULAR FLUID Channel protein Solute CYTOPLASM
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Movement across plasma membrane: Passive Transport Osmosis :
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Osmosis Figure 7.12
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Osmosis Hypotonic solution
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Unformatted text preview: Isotonic solution Hypertonic solution H 2 O H 2 O H 2 O H 2 O Lysed Normal Shriveled Movement across plasma membrane: Active Transport Movement across plasma membrane: Bulk Transport Endocytosis Exocytosis Endocytosis Phagocytosis Pinocytosis Exocytosis Secretion Two Types of Cells Prokaryotic cells Eukaryotic cells Prokaryotic Cells Eukaryotic Cells Eukaryotic cells contain organelles Little organs Nucleus Nuclear envelope Nuclear pore Nucleolus Endoplasmic Reticulum Rough ER Smooth ER Golgi Apparatus Stacked membranous sacs Lysosomes Membranous sacs Mitochondria Powerhouses of the cell Eukaryotic cells contain a cytoskeleton Three types of protein fibers make up the cytoskeleton Microtubules Microfilaments Intermediate filaments Microtubules Structure Functions Microtubules: Cell Division Microtubules: Cilia and Flagella Microfilaments Structure Functions Microfilaments: Cell Shape Microfilaments: Muscle Contraction Actin filament Myosin filament Muscle cell Myosin arm Microfilaments: Cell Crawling Microfilaments: Cell Division Intermediate Filaments Structure Functions:...
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This note was uploaded on 04/22/2009 for the course BIO 309D taught by Professor Jessicawandelt during the Spring '08 term at University of Texas at Austin.

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Lecture 3 - Cells (1) - Isotonic solution Hypertonic...

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