Which of the following is known as soluble $RNA$ $(sRNA)$?

The substance that acts as the connecting link between two generations is:

Who proposed the double helix model of $DNA$?

What forms the backbone of a polynucleotide chain?

Which scientist's observations were the basis for the rule that the ratio between Adenine and Thymine,and Guanine and Cytosine in $DNA$ remains constant and equal to one another?

What is the width (distance) between the two polynucleotide chains of $DNA$?