Explain the role of the following scientists:
$1.$ Avery, MacLeod, and McCarty $(1933-44)$
$2.$ Matthew Meselson and Franklin Stahl $(1958)$

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(N/A) $1.$ Oswald Avery, Colin MacLeod, and Maclyn McCarty $(1933-44)$: They worked to determine the biochemical nature of the 'transforming principle' in Griffith's experiment. They discovered that $DNA$ is the genetic material, not protein or $RNA$, by using enzymes like DNase, RNase, and protease.
$2.$ Matthew Meselson and Franklin Stahl $(1958)$: They performed an experiment using $E. coli$ grown in a medium containing $^{15}N$ (heavy nitrogen) and then transferred to $^{14}N$ (light nitrogen). Their results proved that $DNA$ replication is semi-conservative.

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Match the following columns:
Column-$I$Column-$II$Column-$III$
$(1) \ 1952$$(a)$ Watson and Crick$(i)$ Double helix model of $DNA$
$(2) \ 1928$$(b)$ Friedrich Miescher$(ii)$ Proof that $DNA$ is genetic material
$(3) \ 1869$$(c)$ Griffith$(iii)$ Nuclein
$(4) \ 1953$$(d)$ Hershey and Chase$(iv)$ Transforming principle

Match the process in Column-$I$ with the enzyme involved in Column-$II$.
Column-$I$Column-$II$
$(A)$ $DNA$ replication$(p)$ $RNA$ polymerase
$(B)$ Translation$(q)$ $DNA$ polymerase
$(C)$ Transcription$(r)$ Reverse transcriptase
$(D)$ Reverse transcription$(s)$ Aminoacyl synthetase

Select the code for the correct answer from the options given below.

Segment of $DNA$ which is responsible for inheritance and expression of a particular character is known as

Match the columns.
Column-$I$Column-$II$
$(a)$ Splicing$(1)$ Lac Operon
$(b)$ Okazaki fragments$(2)$ Lagging strands
$(c)$ Jacob and Monod$(3)$ Lactose
$(d)$ Inducer$(4)$ Removal of introns

Which of the following is used as a screening agent in the replica plating experiment?

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