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why Pyrimidines are called Single-ringed Pyrimidine?

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

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

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