Question

In the nucleoside a base is attached at $1^{\prime }$ position of sugar moiety. Nucleotide is formed by linking of phosphoric acid unit to the sugar unit of nucleoside. At which position of sugar unit is the phosphoric acid linked in a nucleoside to give a nucleotide?

Answer 1

In a nucleoside a base is attached at $1^{\prime }$ position of sugar moiety. Nucleoside is linked to phosphoric acid at $5^{\prime }$-position of sugar moiety to give nucleotide. The same phosphoric acid unit is linked to $3^{\prime }$ position of sugar moiety of other attached nucleoside.