Question

Nirenberg used an artificial mRNA poly U (UUU...U) which gave rise to polyphenylalanine. This proved that

• A. Artificial mRNA was not useful for the study of genetic code
• B. Genetic code is triplet
• C. Triplet UUU code for phenylalanine
• D. Genetic code is non-overlapping

Answer 1

The correct option is C Triplet UUU code for phenylalanine

Each genetic codon consists of three nitrogenous bases. In the artificial mRNA poly U chain, only uracil base was present. Its translation led to the accumulation of phenylalanine. Since genetic codon is a triplet codon, it proved that triplet UUU codes for phenylalanine.

So, the correct option is 'Triplet UUU code for phenylalanine'.