Cell Structure & Function

Cell Structure & Function

Cell Structure & Function http://koning.ecsu.ctstateu.edu/cell/cell.html 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. Definition of Cell A cell is the smallest unit that is capable of performing life functions.

Examples of Cells Amoeba Proteus Plant Stem Bacteria Red Blood Cell Nerve Cell

Prokaryotic Do not have structures surrounded by membranes Few internal structures One-celled

organisms, Bacteria http://library.thinkquest.org/C004535/prokaryotic_cells.html Eukaryotic Contain organelles surrounded by membranes Most living organisms Plant

http://library.thinkquest.org/C004535/eukaryotic_cells.html Animal Typical Animal Cell http://web.jjay.cuny.edu/~acarpi/NSC/images/cell.gif Typical Plant Cell

http://waynesword.palomar.edu/images/plant3.gif Cell Parts Organelles Cell Membrane Outer membrane of cell that controls movement

in and out of the cell Double lipid layer http://library.thinkquest.org/12413/structures.html Cell Wall Most commonly found in plant cells & bacteria

Supports & protects cells http://library.thinkquest.org/12413/structures.html Nucleus Directs cell activities Separated from cytoplasm by nuclear membrane

Contains genetic material - DNA Nuclear Membrane Surrounds nucleus Made of two layers Openings allow material to enter and leave nucleus

http://library.thinkquest.org/12413/structures.html Chromosomes In nucleus Made of DNA Contain instructions for traits & characteristics

http://library.thinkquest.org/12413/structures.html Nucleolus Inside nucleus Contains RNA to build proteins http://library.thinkquest.org/12413/structures.html

Cytoplasm Gel-like mixture Surrounded by cell membrane Contains hereditary material 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 Ribosomes Each cell contains

thousands Make proteins Found on ER & floating throughout the cell http://library.thinkquest.org/12413/structures.html 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 Golgi Bodies Protein 'packaging plant' Move materials within the cell Move materials out of the cell

http://library.thinkquest.org/12413/structures.html 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 Vacuoles Membrane-bound sacs for storage,

digestion, and waste removal Contains water solution Help plants maintain shape http://library.thinkquest.org/12413/structures.html

Chloroplast Found in plant cells Contains green chlorophyll Where photosynthesis takes place http://library.thinkquest.org/12413/structures.html

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