$RNA$ does not contain which of the following?

Which of the following is the primary component of $DNA$?

Which of the following ratios remains constant for the $DNA$ of every species?

If the distance between two consecutive base pairs is $0.34 \, nm$ and the total number of base pairs of a $DNA$ double helix in a typical mammalian cell is $6.6 \times 10^{9} \, bp$,then the length of the $DNA$ is approximately:

What are the length of one full turn of the $DNA$ helix and the distance between the two strands (polynucleotides)?

Which nitrogenous base is not present in $RNA$?