Chapter_4_Outline_Part_I_

Chapter_4_Outline_Part_I_ - Chapter 4 Cell Structure &...

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Chapter 4 Part I Biol 1001 Spring 2012
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Discovery of the Cell 1665 A.D. - Robert Hooke invented primitive microscope Observed “little boxes” (=cells) in cork Discovered similar structures in live plants 1670 A.D. - Anton van Leeuwenhoek Discovered “animalcules” in water samples Mostly single-celled organisms Observed blood, sperm, microscopic eggs Countered idea of spontaneous generation fleas believed to emerge from dust
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Light Microscopy most commonly used light used to illuminate specimen stains often used to provide contrast 50 micrometers cilia nucleus contractile vacuole Paramecium
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Electron Microscopy beams of electrons replace light magnetic fields focus image Transmission Electron Microscope electrons passed through specimen interior details of cell visible Scanning Electron Microscope electrons bounced off of specimen 3-D image produced basal bodies 0.5 micrometers mitochondrion
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The Cell Theory Developed in 1855 3 Principals every living organism is made up of 1 or more cells smallest living organisms are single cells & cells are functional units of multicellular organisms Cells = basic unit of life cells arise from pre-existing cells Cells reproduce!!!
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Cells Must obtain energy & nutrients Must eliminate wate Must reproduce Many interact with other cells
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Common Features of Cells small in size 1-100 micrometers (µm) Aids in nutrient &waste exchange with external environment All have plasma membrane cytoplasm frog embryo most eukaryotic cells mitochondrion most prokaryotic cells virus proteins diameter of DNA double helix chicken egg adult human tallest trees atoms Size 100 m 10 m 1 m 10 cm 1 cm visible with unaided human eye visible with light microscope 1 mm 100 μ m 10 μ m 1 μ m 100 nm 10 nm 1 nm 0.1 nm visible with conventional electron microscope visible with special
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Plasma Membrane thin, fluid membrane that encloses cell phospholipid bilayer with embedded proteins Functions isolates cell contents from external environment Allows for cellular interactions with other cells environment
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This note was uploaded on 02/24/2012 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Chapter_4_Outline_Part_I_ - Chapter 4 Cell Structure &...

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