In DNA and RNA, nitrogen atom is present in the ring system. Can Kjeldahl method be used for the estimation of nitrogen present in these ? Give reasons.

In DNA and RNA, nitrogen atom is present in the ring system. Can Kjeld

1.	In DNA and RNA, nitrogen atom is present in the ring system. Can Kjeldahl method be used for the estimation of nitrogen present in these ? Give reasons.
Answer» Solution :In DNA and RNA, nitrogen is present in heterocyclic rings. Since Kjeldahl method cannot be USED to ESTIMATE nitrogen present in rings, azo and NTRO groups because nitrogen present in these systems/groups cannot be completely converted into `(NH_(4))_(2)SO_(4)` during digestion. THEREFORE, Kjeldahl method cannot be used to estimate nitrogen present in DNA and RNA.