$DNA$ polymerase links nucleotide by forming which type of bond:

Assertion : In a $DNA$ molecule, $A-T$ rich parts melt before $G-C$ rich parts.

Reason : In between $A$ and $T$ there are three $H-$ bond, whereas in between $G$ and $C$ there are two $H-$ bonds.

Information flow or central dogma of modern biology is

Describe the structure of polynucleotide chain of DNA or RNA ?
 

Uridine is formed when pyrimidine nitrogen base uracil joins with