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DNA

In addition, the DNA contains four types of bases, thymine (nucleotide deoxy-thymidylic
acid), cytosine (nucleotide deoxy-cytidylic acid), adenine (nucleotide deoxy-adenylic acid), and guanine
(nucleotide deoxy-guanylic acid), whereas the RNA contains cytosine (nucleotide cytidylic acid),
uracil (nucleotide uridylic acid), adenine (nucleotide adenylic acid), and guanine (nucleotide guanylic
acid).

Actually the bases are of two types:

 (i) Pyrimidines: Thymine, cytosine and uracil (Fig.7.3).

Fig.7.3

Fig. 7.3 Pyrimidines.

(ii) Purines: Adenine and guanine (Fig. 7.4).

Fig.7.4

Fig. 7.4 Purines.

Fig.7.5

                                             Deoxy-adenosine monophosphate                               Deoxy-cytosine monophosphate
(dAMP)                                                                                      (dCMP)

Fig.7.5

Deoxy-guonosine monophosphate                              Deoxy-thymosine monophosphate

(dGMP)                                                                        (dTMP)

Fig. 7.5 Deoxy-ribo-nucleotides (dNTP).