Question

In a mRNA sequence of N${}_2$-base is 5' AUG GUG CUC AAA 3'. What is the correct sequence of anticodons which recognizes codons of mRNA

• A. a, b, c, d
• B. d, a, b, c
• C. c, d, b, a
• D. d, c, b, a

Answer 1

The correct option is C c, d, b, a

The primary nucleobases are cytosine (DNA and RNA), guanine (DNA and RNA), adenine (DNA and RNA), thymine (DNA) and uracil (RNA), abbreviated as C, G, A, T and U respectively. Because A, G, C, and T appear in the DNA, these molecules are called DNA-bases. A, G, C and U are called as RNA-bases. Uracil and thymine are identical except that uracil lacks the 5' methyl group. Adenine and guanine belong to the double-ringed class of molecules called purines. Cytosine, thymine, and uracil are all pyrimidines. In normal spiral DNA the bases form pairs between the two strands. A with T and C with G. Purines pair with pyrimidines mainly for dimensional reasons. only this combination fits the constant width geometry of the DNA spiral. The A-T and C-G pairings are required to match the hydrogen bonds between the amine and carbonyl groups on the complementary bases. So, if a mRNA sequence of N${}_2$ base is 5' AUG GUG CUC AAA 3', the correct sequence of anticodons are UAC, CAC, GAG and UUU. Thus, option C is correct and other options are wrong.