keynote; ch. 3; cell structure & function
DESCRIPTION
7th, Ch. 3, Cell Biology, Cell structure & functionTRANSCRIPT
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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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Definition of CellA cell is the smallest unit of life that
is capable of performing life’s functions of reproducing and
getting food.
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Examples of Cells
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
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Two Types of Cells
•Prokaryotic•Eukaryotic
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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
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Eukaryotic• Contain organelles surrounded by membranes• Most living organisms
Plant Animal
http://library.thinkquest.org/C004535/eukaryotic_cells.html
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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 Parts
Organelles
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Surrounding the 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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Inside the Cell
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Nucleus
• Directs cell activities• Separated from cytoplasm by nuclear
membrane• Contains genetic material - DNA
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Nuclear Membrane
• Surrounds nucleus• Made of two layers• Openings allow
material to enter and leave nucleus
http://library.thinkquest.org/12413/structures.html
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Chromosomes
• In nucleus• Made of DNA• Contain instructions
for traits & characteristics
http://library.thinkquest.org/12413/structures.html
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Nucleolus
• Inside nucleus• Contains RNA to build
proteins
http://library.thinkquest.org/12413/structures.html
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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 ribosomes
& 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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Vacuoles
• Membrane-bound sacs for storage, digestion, and waste removal
• Contains water solution
• Help plants maintain shape
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