Question

which of these indicates a strand of rna?
the letter u indicating uracil
the letter t indicating thymine

Explanation:

RNA (ribonucleic acid) has uracil (U) as one of its nitrogenous bases. DNA (deoxyribonucleic acid) has thymine (T) instead of uracil. So, the presence of U (uracil) indicates RNA.

Answer:

The letter U indicating uracil.