Download - Hairy T-cell. Definition = Three part theory about cells 1. All living things are made of cells
Who came up with this theory?
1. Schleiden (circa 1838)All plants are made of cells!
Onion skin cells
How big are cells?
• Microscopic (mostly)
• Measured in microns µm
• (micrometers).
• A µm is one millionth of a meter =
• 10-9 m = one thousandth of 1 mm.
How big are cells?
• Largest cell with a metabolism =
Chaos chaos
Size=1-5 mm in length.
common name =
Giant Amoeba
Chaos diffluens, is an amoeba closely related to the giant amoebae
Types of Microscopes
1. Compound light microscope
– Light passes through lenses to magnify image up to 1000X
– Can observe living cells
Types of Microscopes
2. Electron microscope
– Uses a beam of electrons to magnify image
> 1000X– Kills cells being
observed
Common features of all cells
Small size – allows materials to move via diffusion
• Diffusion = process by which molecules move from levels of high concentration to levels of low concentration until equilibrium is reached
Diffusion
• Google Image Result for http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion.gif
Common features of all cells
1. Cell Membrane – selectively/differentially permeable (lets some things in and out)
Common features of all cells
4. Cytoskeleton – proteins that support the cell
(Microtubules &
microfilaments)
If Cells could be really big ……
Star Trek - The Immunity Syndrome
Bibliography
• http://www.hotlinecancer.com/?cat=28• http://news.bbc.co.uk/1/hi/sci/tech/4636121.stm• http://www.thebacteriabusters.com/eColi.html• http://www.lungcancer.co.uk/how.htm• http://www.fi.edu/learn/heart/blood/red.html• http://biology.about.com/library/weekly/aa091400a.htm• http://www.pbs.org/wgbh/amex/babies/peopleevents/e_ovum.html• http://www.dkimages.com/discover/Home/Animals/Birds/Growth-and-Development/Ostrich/
Ostrich/Ostrich-15.html• http://www.flickr.com/photos/71751551@N00/1262329163/• http://commons.wikimedia.org/wiki/Image:Ostrich_egg.jpg• http://www.mambalam.net/slideshow.php?set_albumName=Animalia• http://strangebenevolent.blogspot.com/2007/07/meerkats-and-ostriches.html
•www.madsci.org/posts/archives/dec97/878139903.Cb.r.html
• http://en.wikipedia.org/wiki/Amoeba_proteus• http://en.wikipedia.org/wiki/The_Immunity_Syndrome_(Star_Trek
Bibliography• http://www.pacpress.com/level3/micron.htm• Google Image Result for
http://www.indiana.edu/~phys215/lecture/lecnotes/lecgraphics/diffusion.gif
• http://commons.wikimedia.org/wiki/Image:Diffusion.jpg
• http://library.thinkquest.org/C004535/cell_membranes.html
• http://sun.menloschool.org/~cweaver/cells/e/ribosomes/
• http://www.elmhurst.edu/~chm/vchembook/580DNA.html• http://sciencecity.oupchina.com.hk/biology/student/glossary/cytoplasm.asp• http://www.uic.edu/classes/bios/bios100/lecturesf04am/lect06.htm