(B) In $DNA$,the four nitrogenous bases are $Adenine$ $(A)$,$Guanine$ $(G)$,$Cytosine$ $(C)$,and $Thymine$ $(T)$.In $RNA$,$Thymine$ is replaced by $Ur

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(B) In $DNA$,the four nitrogenous bases are $Adenine$ $(A)$,$Guanine$ $(G)$,$Cytosine$ $(C)$,and $Thymine$ $(T)$.In $RNA$,$Thymine$ is replaced by $Uracil$ $(U)$.Therefore,$RNA$ contains $Adenine$,$Guanine$,$Cytosine$,and $Uracil$ instead of $Thymine$.