Notes 05 The Cell

Notes 05 The Cell - The Cell Cell Theory cells are the...

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Unformatted text preview: The Cell Cell Theory cells are the basic unit of all living things and all cells come from other cells Robert Hooke (1665) looked at cork under the microscope and named the structures cells meaning little room Schleiden and Schwann (1838-39) determined that all living things are composed of cells (1st part of the cell theory) Rudolph Virchow (1858) determined all living cells arise from preexisting cells (NO spontaneous generation of cells from nonliving matter) (2nd part of the cell theory) All cells must maintain homeostasis (process of maintaining an internal environment that is appropriate and supportive to life) All cells have a plasma membrane acts as a selective barrier All cells have cytoplasm semifluid medium in cell most cells have organelles structures specialized for various functions Cell size is limited small because of the relationship between surface area and volume everything must enter and leave through the membrane surface area of membrane must be large enough relative to cell volume to keep up with passage of materials in and out cells are usually measured in micrometers ( m) 1/1,000,000 (one-millionth) of a meter cell components are measured in nanometers (nm) 1/1,000,000,000 (one-billionth) of a meter...
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This note was uploaded on 10/09/2010 for the course SCI Bio taught by Professor Lin during the Spring '09 term at Walnut Hill.

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Notes 05 The Cell - The Cell Cell Theory cells are the...

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