Which among the following is a double ring containing nitrogen base present in nucleic acids?

Which of the following is responsible for hereditary characters?

If on a strand of $DNA$ the base sequence is $ATTGACGCAT$ then the sequence transcription on $RNA$ would be

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

Which base is present in $RNA$ but not in $DNA$?

Which statement is correct for the nucleotides of $DNA$?