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7.1 The Discovery of Cells

7.1 The Discovery of Cells. Cell Theory All organisms are composed of one or more cells. The cell is the basic unit of organisms. All cells come from preexisting cells. content.answers.com/.../ 300px-Hooke's_cork.png. 7.1 The Discovery of Cells.

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7.1 The Discovery of Cells

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  1. 7.1 The Discovery of Cells • Cell Theory • All organisms are composed of one or more cells. • The cell is the basic unit of organisms. • All cells come from preexisting cells. content.answers.com/.../ 300px-Hooke's_cork.png

  2. 7.1 The Discovery of Cells • All cells come from one cell…they just keep dividing • All cells contain all the genetic info. or DNA • Some cells have special functions and use only a small part of the DNA www.csa.com/.../stemcell/images/pluri.jpg

  3. 7.1 The Discovery of Cells Types of Cells • Prokaryotic • No membrane bound organelles • No nucleus • Most unicellular organisms ww.phschool.com/.../ images/cells/allcell.jpg

  4. 7.1 The Discovery of Cells • Eukaryotic • Membrane bound organelles • Nucleus • Most multicellular (except ameobas, yeast and some algae) • Much larger (see pg 174)

  5. Animal vs. Plant Cell Note the differences!

  6. CELLS Prokaryotic Eukaryotic Animal cell Plant Cell

  7. Cell Wall • Found in plant cells • Located outside the Plasma membrane • Function: protection and support • Made of cellulose

  8. 7.2 The Plasma Membrane • Plasma Membrane: • Flexible boundary between cells & environment • Selectively permeable: ___ • Phospholipid Bilayer • Cholesterol, Protein www.biology.arizona.edu/.../ graphics/bilayer.giff fig.cox.miami.edu/.../ 150/memb/fluidmosaic.jpg nai.arc.nasa.gov/team/ images/2006/ciw/1829/1.jpg

  9. 7.2 The Plasma Membrane Fluid Mosaic Model fig.cox.miami.edu/.../ 150/memb/fluidmosaic.jpg http://www.bio.davidson.edu/people/macampbell/111/memb-swf/membranes.swf fig.cox.miami.edu/.../ 150/memb/fluidmosaic.jpg

  10. 7.2 The Plasma Membrane academic.brooklyn.cuny.edu/biology/bio4fv/pag...

  11. Nucleus • Manages and controls all cell functions • Holds genetic information • Nucleolus is found there • Makes ribosomes www.palaeos.com/.../Lists/Images/nucleolus.jpg iweb.tntech.edu/mcaprio/normalonionskin.jpg

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