To identify the host cell that has taken up the gene of interest
RNA has Uracil instead of Thymine. All the other three bases also occurs in RNA, adenine, guanine and cytosine. Therefore a ATA DNA codon will be transcript to UAU by RNA. Both Thymine and Uracil have the same role in however have minor chemical differences.
Scientists find most deep-ocean trenches in the Pacific. Example being the Mariana Trench.
I believe that it’s answer A and C
