......... is responsible for hereditary traits in all living organisms.

Identify the correct features of $DNA$ from the following statements:
$(i)$ It is made of two polynucleotide chains.
(ii) The backbone is constituted by sugar and phosphate.
(iii) The two chains have anti-parallel polarity.
(iv) The bases in the two strands are linked through $H$-bonds.
$(v)$ Both chains are coiled in a right-handed fashion.

Which of the following statements regarding $DNA$ is incorrect?

In a $DNA$ fragment containing $6$ adenine nitrogen bases,what is the number of thymine nitrogen bases?

What is the length of one full turn of the $DNA$ helix?

Which one of the following can form a nucleotide of $DNA$?