Which carbon atom of deoxyribose sugar in $DNA$ does $NOT$ contain the $-OH$ group?

The number of hydrogen bonds between guanine and cytosine; and between adenine and thymine in $DNA$ is

Nucleic acid is a polymer of

Which of the following bases are present both in $DNA$ and $RNA$?

The type of linkage present between nucleotides is

In the $DNA$ of $E. coli$,the mole ratio of adenine to cytosine is $0.7$. If the number of moles of adenine in the $DNA$ is $350000$,the number of moles of guanine is equal to: