The $1$ gene $1$ enzyme relationship was first established in .......... .

Which of the following does not follow the Central Dogma of molecular biology?

The $T_4$ bacteriophage $rII$ mutant strain fails to lyse $E. coli$. However,when two strains $rII^X$ and $rII^Y$ are mixed,they lyse $E. coli$. What is the possible reason for this?

Explain the following terms:
$1.$ Leading strand - Lagging strand
$2.$ $t-RNA$ - $m-RNA$
$3.$ Monocistronic - Polycistronic

Given below are two statements.
Statement $I$: Heterocatalytic function of $DNA$ includes transcription and translation.
Statement $II$: $A$ unique feature of $DNA$ molecule which helps in its semiconservative duplication is the complementary nature of two strands.
In the light of the above statements,choose the correct answer from the options given below.

The diagram shows an important concept in the genetic implication of $DNA$. Fill in the blanks $A$ to $C$.