Question

In the base sequence, one strand of DNA is CAT, TAG ,CAT, GAC. What would be the base sequence of its complementary mRNA?

• A. GUA, GUA, CUG, AUC, CUG
• B. AUG, CUG, CUC, GUA, CUG
• C. GUA, AUC, GUA, CUG
• D. GUC, CUG, CUG, CUA, CUU

Answer 1

The correct option is C GUA, AUC, GUA, CUG

• If the base sequence of one strand of DNA is CAT, TAG, CAT, GAC, the base sequence of its complementary mRNA would be GUA, AUC, GUA, CUG because, in RNA, uracil binds to adenine via two hydrogen bonds.
• Each nucleotide in RNA contains a ribose sugar, with carbons, numbered 1' through 5'. A base is attached to the 1' position, in general, adenine (A), cytosine (C), guanine (G), or uracil (U). Adenine and guanine are purines, cytosine and uracil are pyrimidines.
  

So, the correct answer is option C.