Which of the following contributes to the double helical structure of $DNA$?

Which of the following correctly represents hydrogen bonded pairs in $DNA$?

$RNA$ is different from $DNA$ because $RNA$ contains

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

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

The process of $DNA$ replication is known as........