In $DNA$,the base units are linked by which of the following?

The sequence in nucleic acids is .......

In the sugar that differentiates $RNA$ from $DNA$,the presence or absence of the $-OH$ group occurs at which carbon atom?

Which of the following is not a type of $RNA$?

Which from the following nitrogen bases of nucleic acids is derived from purine?

When two nucleotides are linked together by a phosphodiester bond to form a dinucleotide,which carbon atoms of the pentose sugar of the nucleotides are involved in the linkage?