Diffusion - Review Molecules move from areas of high concentration to areas of low concentration How...
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Diffusion - Review• Molecules move from areas of high
concentration to areas of low concentration• How do diffusion/osmosis/active transport
differ?• https://www.youtube.com/watch?v=IaZ8MtF3
C6M
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Cell Structure & Function
http://koning.ecsu.ctstateu.edu/cell/cell.html
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Cell Theory• All living things are made up of cells. • Cells are the smallest working units of all living
things. • All cells come from preexisting cells through
cell division.
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Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
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Prokaryotic• Do not have structures
surrounded by membranes
• Few internal structures
• One-celled organisms, Bacteria
http://library.thinkquest.org/C004535/prokaryotic_cells.html
Two Types of CellsEukaryotic
• Contain organelles surrounded by membranes
• Most living organisms
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“Typical” Animal Cell
http://web.jjay.cuny.edu/~acarpi/NSC/images/cell.gif
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http://waynesword.palomar.edu/images/plant3.gif
“Typical” Plant Cell
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Cell Membrane
• Outer membrane of cell that controls movement in and out of the cell
• Double layer
http://library.thinkquest.org/12413/structures.html
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Cell Wall
• Most commonly found in plant cells & bacteria
• Supports & protects cells
http://library.thinkquest.org/12413/structures.html
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Nucleus • Directs cell activities• Separated from cytoplasm by nuclear
membrane• Contains genetic material - DNA
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Cytoplasm• Gel-like mixture• Surrounded by cell membrane• Contains hereditary material
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Endoplasmic Reticulum• Moves materials around in
cell• Smooth type: lacks
ribosomes• Rough type (pictured):
ribosomes embedded in surface
http://library.thinkquest.org/12413/structures.html
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Ribosomes
• Each cell contains thousands
• Make proteins• Found on ER & floating
throughout the cell
http://library.thinkquest.org/12413/structures.html
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Mitochondria• Produces energy through
chemical reactions – breaking down fats & carbohydrates
• Controls level of water and other materials in cell
• Recycles and decomposes proteins, fats, and carbohydrates
http://library.thinkquest.org/12413/structures.html
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Golgi Bodies
• Protein 'packaging plant'
• Move materials within the cell
• Move materials out of the cell
http://library.thinkquest.org/12413/structures.html
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Lysosome• Digestive 'plant' for
proteins, fats, and carbohydrates
• Transports undigested material to cell membrane for removal
• Cell breaks down if lysosome explodes
http://library.thinkquest.org/12413/structures.html
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Chloroplast
• Usually found in plant cells
• Contains green chlorophyll
• Where photosynthesis takes place
http://library.thinkquest.org/12413/structures.html