DNA & RNA

DNA:

Its monomer is deoxyribonucleotide.
There are so many structures of DNA proposed so far, among which Watson and Crick's right-handed beta model is most widely accepted.
The two polynucleotide chains in DNA are twisted around a common axis but run in opposite directions to form a right-handed helix.
The two DNA stands for are antiparallel (i.e. one 3'-5'and other and complementary.
DNA is antiparallel due to a phosphodiester bond.
Two strands are held together by H-bonding.
Two strands of DNA are complementary.
Base pair is very much specific.
Two nucleotides are held together by a phosphodiester bond.
The bond between sugar and nitrogen base is Glycosidic bond.
One complete DNA consists of 10 base pairs.
The distance between the two successive base pair is 3.4A0. The width of the DNA is 20 A0.
Nitrogen bases in DNA are adenine, Guanine, Cytosine and Thymine.