In the sugar that differentiates $RNA$ from $DNA$,the presence or absence of the $-OH$ group occurs at which carbon atom?

The total number of correct statements regarding the nucleic acids is..............
$A$. $RNA$ is regarded as the reserve of genetic information.
$B$. $DNA$ molecule self-duplicates during cell division.
$C$. $DNA$ synthesizes proteins in the cell.
$D$. The message for the synthesis of particular proteins is present in $DNA$.
$E$. Identical $DNA$ strands are transferred to daughter cells.

The sugar units present in natural $DNA$ and $RNA,$ respectively 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.

What are the positions of $N$ atoms present in the pyrimidine ring of nucleic acids?

In the double-strand helix structure of $DNA,$ thymine forms hydrogen bonds with