$A$ gene is made up of

In $DNA$,uracil is replaced by

The linkage between two nucleotides occurs between the $3'$ carbon of the sugar of the first nucleotide and the $5'$ carbon of the sugar of the second nucleotide. Which of the following correctly represents these positions?

Chargaff's rule is given as:

Who provided the data for $X$-ray diffraction of $DNA$?

In a $DNA$ molecule,one chain contains $22$ thymine and its opposite chain contains $28$ guanine. What is the length of this $DNA$ in $\mathring{A}$?