bases evolution URGENT!

Cátia Calé katija at netc.pt
Wed Feb 27 04:12:14 EST 2002


Hi! could you answer me to the next questions, please?
- Why DNA´s uracil base evoluted  to timine; do you think that there is some
relation between this evolution and repair mechanisms? or  with CpG islands-
Hotspots in wich there is desmetilation of metilated citosine that origines
timine...?
- what´s the difference between holliday model and the branch in double
strand? this is related with the number of Holliday structures formed or
with the inital splicing?

thanks





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