<Li> V = GCA (all but T) </Li> <Li> N = AGCT (any) </Li> <P> These symbols are also valid for RNA, except with U (uracil) replacing T (thymine). </P> <P> Apart from adenine (A), cytosine (C), guanine (G), thymine (T) and uracil (U), DNA and RNA also contain bases that have been modified after the nucleic acid chain has been formed . In DNA, the most common modified base is 5 - methylcytidine (m5C). In RNA, there are many modified bases, including pseudouridine (Ψ), dihydrouridine (D), inosine (I), ribothymidine (rT) and 7 - methylguanosine (m7G). Hypoxanthine and xanthine are two of the many bases created through mutagen presence, both of them through deamination (replacement of the amine - group with a carbonyl - group). Hypoxanthine is produced from adenine, xanthine from guanine . Similarly, deamination of cytosine results in uracil . </P>

Why is there not a test for nucleic acids