Question

The nucleotide sequence at a specific region in the non-coding strand of a DNA molecule was found to be CAT GTT TAT CGC. What would be the nucleotide sequence in the mRNA that is synthesized from the corresponding region of the coding strand in that DNA?

• A. GUA CAA AUA GCC
• B. GTA CAA ATA GCC
• C. CAU GUU UAU CGC
• D. CAA GAA TAU GCC

Answer 1

The correct option is C CAU GUU UAU CGC

Sequence in coding strand will be complementary to the sequence in the non-coding strand. Thus, the complementary sequence in the coding strand is GTA CAA ATA GCG.
mRNA sequence will be complementary to the sequence on coding strand and thus, it will be CAU GUU UAU CGC (T is replaced by U in RNA sequence).
As the mRNA sequence is same as the sequence on non-coding strand with T replaced by U. Thus, the correct answer is option C.