Question

why can uracil be used as a \clue\ to identify rna in a strand? because uracil is found in both dna and rna. because uracil indicates a damaged dna strand. because uracil is always paired with thymine. because uracil is unique to rna.

Explanation:

Uracil is a nitrogen - containing base that is present only in RNA. DNA contains thymine instead. So its presence can identify RNA.

Answer:

Because uracil is unique to RNA.