Bio 1510 -4_1 - Bio 1510 Basic Life Mechanisms Fall 2008...

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Bio – 1510 Basic Life Mechanisms Fall 2008 Dr. Rasheeda Zafar Chapter # 4 Cell Theory Prokaryotic Cells, Eukaryotic Cells, Structure and Function 1
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Cell Theory Cell Theory All living things are composed of one or more cells All cells form from the division of pre-existing cells All cells today represent a continuous line of descent from the first living cells Schleiden ( 1838) and Schwann (1839) proposed the Cell Theory Cell Theory. 2
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Cell Size Cell Size Cell size is limited Increase in cell size = longer time for material to diffuse into the cell Surface area to volume ratio Surface area to volume ratio As cell size increases, volume cell size increases, volume increases 10 X faster than surface area increases 10 X faster than surface area Microscopes required to visualize cells Light microscope = 200 nm apart Electron microscope = 0.2 nm apart 3
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Cell Theory Cell Theory Cells exhibit basic structural similarities Cells exhibit basic structural similarities Genetic material Genetic material Present in nucleoid or nucleus Cytoplasm Cytoplasm A semi fluid matrix Plasma membrane Plasma membrane Phospholipid bilayer 4
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Categories of Cells Categories of Cells Two major categories of cells Two major categories of cells Prokaryotes Simple Archaea Bacteria Eukaryotes Complex Plantae, Fungi, Animalia, Protista 5
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Prokaryotic Cells 6 Simplest Organisms Genetic material in the nucleoid Cytoplasm surrounded by plasma membrane
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Bio 1510 -4_1 - Bio 1510 Basic Life Mechanisms Fall 2008...

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