Question

what are the different types of nitrogenous bases? Name them.How they are there?​

Answer 1

1. There are two basic types of nitrogenous bases, pyrimidines and purines .
2. These are essentially planar, hydrophobic, weak bases.
3. Five nitrogenous bases are found in nucleic acids ; adenine (A), guanine (G), and cytosine (C) are in both DNA and RNA, whereas thymine (T) is almost exclusively found in DNA, and uracil (U) almost exclusively in RN A.
4. DNA and RNA are quantified by their absorption of UV light at 260 nm. This absorption is the result of the resonating conjugated double bonds of the purines and pyrimidines.

Answer 2

Answer:

Margaret Scofield, in xPharm: The Comprehensive Pharmacology Reference, 2007

Nitrogenous Bases: There are two basic types of nitrogenous bases, pyrimidines and purines (Fig. 3). These are essentially planar, hydrophobic, weak bases. Five nitrogenous bases are found in nucleic acids (Fig. 4); adenine (A), guanine (G), and cytosine (C) are in both DNA and RNA, whereas thymine (T) is almost exclusively found in DNA, and uracil (U) almost exclusively in RN A. DNA and RNA are quantified by their absorption of UV light at 260 nm. This absorption is the result of the resonating conjugated double bonds of the purines and pyrimidines.