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

$RNA$ is different from $DNA$ because it contains ...

The type of linkage present between nucleotides is

Which moieties of nucleosides are involved in the formation of phosphodiester linkages present in dinucleotides? What does the word 'diester' in the name of linkage indicate? Which acid is involved in the formation of this linkage?

The structure of $DNA$ is

In a nucleotide,the phosphate linkage is generally attached to -