Nucleic acids

For a double strand DNA, one strand is given below:

$$5'\text{-A G T C A C G T A A G T C-}3'$$

The amount of energy required to split the double strand DNA into two single strands is _____ $\mathrm{kcal\,mol^{-1}}$.

[Given: Average energy per H-bond for A-T base pair $= 1.0\,\mathrm{kcal\,mol^{-1}}$, G-C base pair $= 1.5\,\mathrm{kcal\,mol^{-1}}$, and A-U base pair $= 1.25\,\mathrm{kcal\,mol^{-1}}$. Ignore electrostatic repulsion between the phosphate groups.]

The number of oxygens present in a nucleotide formed from a base, that is present only in RNA is ______.

Sugar moiety in DNA and RNA molecules respectively are

The sugar produced after complete hydrolysis of DNA is

Which one of the following bases is not present in DNA ?

The reason for double helical structure of DNA is the operation of :