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(D) $1$. Nucleic acids ($DNA$ or $RNA$) serve as the genetic material in all living organisms.$2$. In recombinant $DNA$ technology,the $DNA$ must be i

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All of the above.

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(D) $1$. Nucleic acids ($DNA$ or $RNA$) serve as the genetic material in all living organisms.$2$. In recombinant $DNA$ technology,the $DNA$ must be in a pure form,free from other macromolecules like proteins,$RNA$,polysaccharides,and lipids,to be effectively cleaved by restriction endonucleases.$3$. The $DNA$ molecule is composed of four types of nucleotides,which differ based on their nitrogenous bases ($Adenine$,$Guanine$,$Cytosine$,and $Thymine$).Since all the given statements are scientifically correct,the correct option is $D$.

Column-$I$	Column-$II$
$(p)$ $AUG$	$(a)$ Transposons
$(q)$ $UGA$	$(b)$ Jacob and Monod
$(r)$ Jumping genes	$(c)$ Termination codon
$(s)$ Operon model	$(d)$ Methionine

List-$I$	List-$II$
$(a)$ Helicase	$(i)$ $DNA$-dependent $DNA$ synthesis
$(b)$ Ribonuclease	$(ii)$ Digestion of $RNA$
$(c)$ Reverse transcriptase	$(iii)$ Breaking hydrogen bonds between $DNA$ strands
$(d)$ $DNA$ polymerase	$(iv)$ $RNA$-dependent $DNA$ synthesis

Column $I$	Column $II$
$(a)$ $m-RNA$	$(i)$ Found in ribosomes
$(b)$ $t-RNA$	$(ii)$ Carries information from $DNA$ to the cytoplasm for protein synthesis
$(c)$ $r-RNA$	$(iii)$ Contains $75$ nucleotides
$(d)$ $RNA$	$(iv)$ $A$ polynucleotide chain containing ribose sugar and uracil base,existing in three types

Select the correct statement from the following.

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Match the following columns:
Column-$I$ Column-$II$
$(p)$ $AUG$ $(a)$ Transposons
$(q)$ $UGA$ $(b)$ Jacob and Monod
$(r)$ Jumping genes $(c)$ Termination codon
$(s)$ Operon model $(d)$ Methionine

Mark the correct match.

$DNA$ generally acts as a template for the synthesis of:

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