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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 • 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 • 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
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
7.1 The Discovery of Cells • Eukaryotic • Membrane bound organelles • Nucleus • Most multicellular (except ameobas, yeast and some algae) • Much larger (see pg 174)
Animal vs. Plant Cell Note the differences!
CELLS Prokaryotic Eukaryotic Animal cell Plant Cell
Cell Wall • Found in plant cells • Located outside the Plasma membrane • Function: protection and support • Made of cellulose
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
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
7.2 The Plasma Membrane academic.brooklyn.cuny.edu/biology/bio4fv/pag...
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