Question

If the base sequence in DNA is 5' AAAA 3' then the bases sequence in mRNA is

• A. 5' UUUU 3'
• B. 3' UUUU 5'
• C. 5' AAAA 3'
• D. 3' TTTT 5'

Answer 1

Answer: (B)

3' UUUU 5'

Transcription is when RNA is made from DNA. During transcription, RNA polymerase makes a copy of a gene from the DNA to mRNA as needed. This process is similar in eukaryotes and prokaryotes. One notable difference, however, is that eukaryotic RNA polymerase associates with mRNA-processing enzymes during transcription so that processing can proceed quickly after the start of transcription. Both RNA and DNA are nucleic acids, which use base pairs of nucleotides as a complementary language. The two can be converted back and forth from DNA to RNA by the action of the correct enzymes. During transcription, a DNA sequence is read by an RNA polymerase, which produces a complementary, antiparallel RNA strand called a primary transcript. As opposed to DNA replication, transcription results in an RNA complement that includes the nucleotide uracil (U) in all instances where thymine (T) would have occurred in a DNA complement. So, if If the base sequence in DNA is 5' AAAA 3' then the bases sequence in m-RNA is 3' UUUU 5'.

So, the correct answer is option B.