| | Re: Pairs of DNA
G and A are purines, they have 2 rings
C and T are pyrimidines, single ringed
G:C has 3 hydrogen bonds
while A:T has 2 hydrogen bonds
having 4 bases instead of two is important in transcribing genetic information, as each triplet of bases will code for a particular codon of mRNA. This mRNA codon is then translated by the ribosome to give a particular amino acid
If there were less than 4 bases then the DNA wouldn't be able to store as much genetic info and having more would be unnecessary.
Last edited by stanhope11; 04-18-2012 at 11:19 AM.