Ch4 - Organization of the Cell Chapter 4 Cell Theory...

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Organization of the Cell Chapter 4
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Cell Theory Smallest unit to carry out all activities associated with life; maintenance, growth and division: contained in DNA codes
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Homeostasis Cells contain many organelles , internal structures that carry out specific functions, that help maintain homeostasis: appropriate internal environment
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Plasma Membrane separates cell from external environment maintains internal conditions allows cell to exchange materials with outer environment encloses internal structures (organelles)
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Prokaryotic versus Eukaryotic* Prokaryotic cells lack internal membrane organization; include a cell wall Interior of eukaryotic cells are divided into compartments by internal membranes * also procaryotic versus eucaryotic
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Fig 4:2 SVR
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Fig 4:1 Size and Shape Most cells are microscopic : Meter (m) (mm) =1/1000m=10(-3)m (μm) = 1/1000,000m =10(-6)m (nm) = 1/1000,000,000m =10(- 9)m
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Microscopes Anton Van Leeuwenhock; Royal Society of London; first to report cells in animals Techniques not developed for 100 yr 19 th C and microscopes Light microscopes Electron microscopes with superior resolving power Most staining kills the cells
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Light source Light microscope Light beam Ocular lens Objective lens Specimen Condenser lens (a) A phase contrast light microscope can be used to view stained or living cells, but at relatively low resolution. 100 μm
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This note was uploaded on 09/25/2010 for the course BIOLOGY Biology 10 taught by Professor D'arville during the Spring '10 term at Rutgers.

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Ch4 - Organization of the Cell Chapter 4 Cell Theory...

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