Introduction to cells

Introduction to cells - 2/6/11 Introduction to cells...

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Unformatted text preview: 2/6/11 Introduction to cells 10-9-07 2/6/11 The Cell Theory All living things are made of 1 or more cells Cells are the basic unit of living things All cells come from pre-existing cells Click icon to add picture 2/6/11 ields of Vision These are the various levels at which certain microsc opes can view 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 Viruses Ribosomes Proteins Lipids Small molecules Atoms Nucleus Most bacteria Mitochondrion Light microscope Electron microscope Electron microscope Human height 2/6/11 Types of Microscopes Uses light to focus Uses electrons to focus Light Microscope Electron Microscope 2/6/11 Use different methods for enhancing visualization of cellular structures TECHNIQUE RESULT Brightfield (unstained specimen). Passes light directly through specimen. Unless cell is naturally pigmented or artificially stained, image has little contrast. [Parts (a)(d) show a human cheek epithelial cell.] (a) Brightfield (stained specimen). Staining with various dyes enhances contrast, but most staining procedures require that cells be fixed (preserved).require that cells be fixed (preserved)....
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Introduction to cells - 2/6/11 Introduction to cells...

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