$DNA$ consists of two polynucleotide chains. Each chain forms a right-handed spiral with how many bases in one turn of the spiral?

$A$ segment of $DNA$ molecule which codes or specifies for one polypeptide chain is called:

In $DNA$,the base units are linked by which of the following?

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

Which of the following statements is not true about $RNA$?

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.