Never - Uracil is only found in RNA. The four bases of DNA are A, T, G and C. In RNA, U replaces T.
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The letter "u" is used in DNA sequences to represent deoxyuridine, which is a base found in RNA but not in DNA. In RNA sequences, "u" stands for uracil instead of thymine, which is found in DNA sequences.
No DNA sequence wont have U (uracil), so it is an RNA sequence!
The mRNA base sequence corresponding to the DNA sequence acgtt is ugcaa. The mRNA sequence is complementary to the DNA sequence, with thymine (T) in DNA being replaced by uracil (U) in mRNA.
The complementary mRNA sequence to the DNA sequence "act" would be "uga" after transcription, where thymine (T) in DNA is replaced by uracil (U) in RNA.
The complimentary mRNA sequence would be: U-A-A-C-G-U
The corresponding messenger RNA sequence for the DNA sequence GCTTAA will be CGAAUU. This is because in RNA, adenine (A) pairs with uracil (U) instead of thymine (T) as in DNA.