<P> Five nucleobases -- adenine ( A ) , cytosine ( C ) , guanine ( G ) , thymine ( T ) , and uracil ( U ) -- are called primary or canonical . They function as the fundamental units of the genetic code , with the bases A , G , C , and T being found in DNA while A , G , C , and U are found in RNA . Thymine and uracil are identical excepting that T includes a methyl group that U lacks . </P>
<P> Five nucleobases -- adenine ( A ) , cytosine ( C ) , guanine ( G ) , thymine ( T ) , and uracil ( U ) -- are called primary or canonical . They function as the fundamental units of the genetic code , with the bases A , G , C , and T being found in DNA while A , G , C , and U are found in RNA . Thymine and uracil are identical excepting that T includes a methyl group that U lacks . </P>
adenine guanine cytosine and thymine are the four in dna
adenine guanine cytosine and thymine are the four in dna
nucleobases
nucleobases