Lecture 3 - Click to edit Master subtitle style Cell...

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Unformatted text preview: Click to edit Master subtitle style Cell Structure and Function Cell Theory Cell is the smallest unit of life All living organisms are composed of cells Cells come from pre-existing cells Characteristics of All Cells Cells are very small Lower limit Upper limit Cant exceed t volume that can be nourished by materials passing through the membrane Surface area-to-volume ratio Cells must obtain energy and nutrients Cells all contain DNA Cells contain cytoplasm Cytosol: semi-fluid substance inside cell Cytoplasm: cytosol + all suspended materials Cells contain ribosomes Particles composed of proteins and RNA Site of protein synthesis Cells are bound by plasma membrane Cells are very small 1 m 0.1 nm 10 m 0.1 m 1 cm 1 mm 100 m 10 m 1 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 Virus es Ribosom es Protei ns Lipid s Small molecules Ato ms Nucleus Most bacteria Mitochondri on Unaided eye Light Microscope Electron microscope Human height Measurements 1 centimeter (cm) = 10&2 meter (m) = 0.4 inch 1 millimeter (mm) = 103 m 1 micrometer (m) = 103 mm = 106 m 1 nanometer (nm) = 103 m = 109 m Cells must obtain energy and nutrients...
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Lecture 3 - Click to edit Master subtitle style Cell...

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