Adenosine is an example of which of the following?

How are nucleotides linked together in nucleic acids?

In both $DNA$ and $RNA$,the heterocyclic base and phosphate ester linkages are at which positions of the sugar molecule?

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 total number of hydrogen bonds in a $DNA$ double helix strand,where one strand has the following sequence of bases,is $...........$
$5^{\prime}-G-G-C-A-A-A-T-C-G-G-C-T-A-3^{\prime}$

The correct statement with regard to the secondary structure of $DNA$/$RNA$ is: