If the sequence of the coding strand in the transcription unit is written as follows: 5’-ATGCATGCATGCATGCATGCATGCATGC-3’
Write down the sequence of mRNA.

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5’-AUGCAUGCAUGGGGGCAUGCAUGCAUGC-3’.

5’-AUGCAUGCAUGCAUGCAUUUUUGCAUGC-3’.

5’-AUGCAUGCAUGCAUGCAUGCAUGCAUGC-3’.

5’-AUGAAAAAAUGCAUGCAUGCAUGCAUGC-3’.

answer is C.

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Detailed Solution

Concept: mRNA is the messenger ribonucleic acid, an ssRNA molecule complementary to the DNA strand. There are two strands- the template and the second one is the coding strand. The template strand runs in a 3’ to 5’ direction, whereas the coding strand runs in a 5’ to 3’ direction.
Since the mRNA contains sequences the same as that of the coding strand of DNA, the only difference in this is that the thymine (T) in the DNA is replaced by uracil (U) in RNA. The given sequence of the coding strand is 5’-ATGCATGCATGCATGCATGCATGCATGC-3’, and so the sequence of the mRNA strand would be 5’-AUGCAUGCAUGCAUGCAUGCAUGCAUGC-3’.
Hence, the correct answer is option 3.

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