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why Pyrimidines are called Single-ringed Pyrimidine?

And why Purines are called Double-ringed Purines? WAITING FOR ASNWERR
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Aamrikhan's Whiteboard
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Nov 11 2008 by Aamrikhan
i am still waiting dear......
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Nov 10 2008 by Aamrikhan

Why in RNA synthesiing U (uracil) replaces the T (thymine) ??any specfic reason for tht????

waiting...and thankss

u can email me my id is ( aamrikhan@yahoo.com ) thanks again...

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Nov 10 2008 by laughing water
go ahead and ask...........
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