Among the following compounds,which one is found in $RNA$?

State the biological importance of nucleic acids.

The segment of $DNA$ which acts as the instrumental manual for the synthesis of the protein is

The pyrimidine bases present in $DNA$ are

Fill in the blanks:
$(1)$ Genetic information containing molecules is known as ........
$(2)$ The formulas of ammonium cyanate and urea are ........ and ......... respectively.
$(3)$ The hybridisation type of carbon in methane,ethane,ethene,and ethyne is ..........,.........,......... and ......... respectively.
$(4)$ From $sp^3, sp^2$ and $sp$ hybrid orbitals,....... is most and ......... is least electronegative.

In $DNA$,the base pairs are held together by which of the following?