Which one of the following statements about the particular entity is true?

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

Match the following and select the correct option:
Column $A$ | Column $B$
$(i)$ Oncogenes | $(1)$ Causes $AIDS$
(ii) Single circular $DNA$ | $(2)$ $Lac$-Operon concept
(iii) Splicing | $(3)$ Component of bacterial chromosome
(iv) Jacob and Monod | $(4)$ Processing of $mRNA$ molecules
| $(5)$ When activated cause cancer
Select the correct sequence for $(i), (ii), (iii), (iv)$ respectively.

Match the following in column $I$ with column $II$ and choose the correct combination.

Column $I$	Column $II$
$a.$ Termination	$i.$ Aminoacyl $t-RNA$ synthetase
$b.$ Translation	$ii.$ Okazaki fragments
$c.$ Transcription	$iii.$ $GTP$ dependent release factor
$d.$ $DNA$ replication	$iv.$ $RNA$ polymerase

Which one of the following pairs is not correctly matched?

Base substitution caused by base analogs is known as: