The nucleic acid base having two possible binding sites is

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

The reason for the double helical structure of $DNA$ is the operation of

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

Which of the following bases is not present in $DNA$?

Which of the following is not present in a nucleotide?