Question

The DNA triplet that would code for the addition of arginine to a polypeptide is

• A. C-G-A
• B. G-C-T
• C. C-C-T
• D. T-A-C
• E. G-C-U

Answer 1

The correct option is B G-C-T

mRNA has complimentary nucleotide sequence to that of its template DNA strand. Adenine makes two hydrogen bonds with thymine and guanine makes three hydrogen bonds with cytosine. The mRNA codon for arginine is CGA, so its corresponding DNA codon would be GCT. Thus, the correct answer is option B.