What is deoxyribonucleic acid $(DNA)$?

What is the similarity between $DNA$ and $RNA$?

How is $DNA$ chemically different from $RNA$?

The amount of $DNA$ in the inactive region is ......

Which of the following statements is inconsistent with $DNA$?

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?