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http://koning.ecsu.ctstateu.edu/cell/cell.html
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.
A cell is the smallest unit that is capable of performing life
functions.
Amoeba Proteus
Plant Stem
Red Blood Cell
Nerve Cell
Bacteria
•Prokaryotic•Eukaryotic
Do not have structures surrounded by membranes
Few internal structures
One-celled organisms, Bacteria
http://library.thinkquest.org/C004535/prokaryotic_cells.html
Contain organelles surrounded by membranes Most living organisms
Plant Animal
http://library.thinkquest.org/C004535/eukaryotic_cells.html
http://web.jjay.cuny.edu/~acarpi/NSC/images/cell.gif
http://waynesword.palomar.edu/images/plant3.gif
Organelles
Outer membrane of cell that controls movement in and out of the cell
It is semi-permeable i.e. let some substances to pass through while stops others.
http://library.thinkquest.org/12413/structures.html
Most commonly found in plant cells & bacteria
Made of a rigid material called cellulose
Supports & protects the cells
http://library.thinkquest.org/12413/structures.html
Directs cell activities Separated from cytoplasm by nuclear
membrane Contains genetic material - DNA
In nucleus Made of DNA Contain
instructions for traits & characteristics
http://library.thinkquest.org/12413/structures.html
Gel-like mixture
Surrounded by cell membrane
Site for chemical reactions such as respiration
Membrane-bound sacs for storage and digestion
Contains water solution
Help plants maintain shape
Some animal cells may have tiny vacuoles
http://library.thinkquest.org/12413/structures.html
Usually found in plant cells
Contains green chlorophyll
Where photosynthesis takes place
http://library.thinkquest.org/12413/structures.html
Cells with modified or improved designs
To enable them to perform a specific function
The following types of animal cells have adapted in order to better perform their function.
White blood cells Red blood cells Nerve cells Ciliated epithelial cells Smooth muscle cells
The following plant cells have adapted to do their job more efficiently
Root hair cells Palisade mesophyll cells Spongy mesophyll cells
A group of identical cells performing the same function form a tissue
Tissues of several type work together to make an organ
Some organs and tissues form organ systems
All organ systems work in harmony for the well being of the organism