Discussion of all aspects of biological molecules, biochemical processes and laboratory procedures in the field.
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What level essay are you working on? Middle-school, high-school, college, etc? Here's a basic list of a few different cellular biology sites to get you started:
http://www.biology-online.org/reference ... r_Biology/
Here's a copy from my notes of a class I took. If you have trouble understanding any of it (it's college level notes), feel free to ask =)
A. Plasma Membrane: Separation
• Phosoholipid bilayer
• Contains integral proteins and peripheral proteins
o Integral proteins—all the way through the bilayer
o Peripheral proteins—poking only through one side of bilayer
• Lipid molecules and proteins move laterally (fluid mosaic model)
• Separates cells from the environment
• Membrane proteins function as
1. Enzymes—regulate chemical reactions within the cell
2. receptors—control the uptake of molecules
3. transport proteins—carriers, channels, and pumps get molecules across membrane into cell (integral)
4. anchors—cytoskeletal proteins/extracellular matrix proteins
http://www.stolaf.edu/people/giannini/b ... tions.html
A very nice series of short animations. Check out the membrane transport section and the lipids section. Bookmark it on your computer.
http://www.northland.cc.mn.us/biology/B ... port1.html
Some more nice animations. These are longer and have explanations.
http://www.biology.arizona.edu/cell_bio ... index.html
The Biology Project’s unit on cell membranes. This site contains an overview and a tutorial with 16 questions and answers.
http://www.cbc.umn.edu/~mwd/cell_www/ch ... brane.html
Another tutorial. Some good images. Terrible mis-use of the term osmosis.
Diffusion and osmosis explanations/demonstrations from Middlebury College.
Two short tutorials with questions, answers, and encouragement (explanations).
http://www.bbc.co.uk/schools/gcsebitesi ... rev1.shtml
Animations and explanations. You have to click on topics on each page to get to the animations.
Outline of cell transport
http://www.emc.maricopa.edu/faculty/far ... ransp.html
Tutorial, pictures – a biology book online.
http://biology.arizona.edu/sciconn/less ... /quiz.html
An on-line quiz.
http://arnica.csustan.edu/Biol1010/memb ... branes.htm
. A concise, sum-it-up page.
http://www.uic.edu/classes/bios/bios100 ... lect07.htm
Straight-forward descriptions and some practice questions.
These should help you
I didn't find them all by myself - my biology teacher gave them to me for a unit on the cell membrane.
No amount of experimentation can ever prove me right; a single experiment can prove me wrong.
A books which is really relevent to this topic is Principles of Biochemistry but it's really written for underguaduates. Another one that could be help is microbiology of the cell.
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