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A level Biology: Post your doubts here!

http://users.rcn.com/jkimball.ma.ultran ... Stahl.html Could someone help me to have a simplified explanation on this experiment? how did the nitrogen-15 affect this experiment ? & what are the reasonings behind the different densities of the test tubes? *Suggest a site please* :%) :%)...
- Safia05
- Post #33
- Oct 12, 2011
- Forum: A-Levels
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mathematics (urgent)

Find the coordinates of the stationary points on the curve y= x2 + 16/x ; and hence sketch the curve . * its y= x (power of 2) + 16/x
- Safia05
- Thread
- Sep 2, 2011
- Replies: 1
- Forum: A-Levels
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chemistry

:P where can i get simplified notes for chemistry - proteins , enzymes & DNA?
- Safia05
- Thread
- Aug 29, 2011
- Replies: 11
- Forum: A-Levels

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