An organism of the wild type that does not require any additional growth supplements for nutrition is called a .....

$Escherichia \ coli$ is an important material for genetic experiments because

Match Column-$I$ with Column-$II$:

Column-$I$	Column-$II$
$(a)$ Lactose	$(i)$ Functional part of the gene
$(b)$ Release factor	$(ii)$ Inducer of $Lac$ operon
$(c)$ Histone	$(iii)$ Packaging of $\text{DNA}$
$(d)$ Exon	$(iv)$ Termination of translation

What is the correct chronological sequence of the following events?
$1.$ Formation of the chromosome theory of heredity
$2.$ Experiments which proved that $DNA$ is the hereditary material
$3.$ Mendel's laws of inheritance discovery
Code:

$A$ $DNA$ strand is directly involved in the synthesis of the following,except:

The alternative valence states of $DNA$ bases in $A=T$ and $G=C$ pairs are known as: