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

When $RNA$ is hydrolysed,there is no relationship among the quantities of different bases obtained. What does this fact suggest about the structure of $RNA$?

Which of the following is not a constituent of nucleic acids?

Which $C$ atom of ribose sugar (numbered from $1^{\prime}$ to $5^{\prime}$) bonds with the phosphate group to form $AMP$ (in $^{\prime}$)?

What is the total number of $-OH$ groups present in a nucleoside involved in the formation of $DNA$?

$DNA$ contains a base that is not present in $RNA$. Identify it.