Kindly Please answer the three questions 1what is the purpos

Solution

1. The main purpose of the DNA is to store and securely transfer the genetic information among the generations. So it is the principal genetic material in all living organisms from Bacteria to Humans. Viruses are semi living organisms that contain either DNA or RNA as genetic material

2. Generally Double helix that was discovered by Watson & Crick by using X-Ray difraction method. Some times triple helix and quadraplex DNAs are also exist

3. Adenine (6-Amino Purine); Guanine (2-Amino-6-Oxo-Purine); Cytosine (2,4- Di Oxo-Pyrimidine), Thymine (2,4- Di Oxo-5-Methyl-Pyrimidine or 5-Methyl Uracil)