In DNA and RNA, nitrogen atom is present in the ring system. Can Kjetdahl. Method be used for the estimation of nitrogen present in these?

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

1.	In DNA and RNA, nitrogen atom is present in the ring system. Can Kjetdahl. Method be used for the estimation of nitrogen present in these?
Answer» Solution :In DNA and RNA, NITROGEN is present in heterocyclic rings, since Kjeldahl method cannot be used to estimate nitrogen present in rings, 920 nad nitro GROUPS because nitrogen present in these system 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