A scientist makes three artificial mRNA strands:
(x) 5' AAAUUUAAAUUUAAAUUUAAAUUUAAA 3'
(y) 5' UUUCCCUUUCCCUUUCCCUUUCCCUUU 3'
(z) 5' AUAUAUAUAUAUAUAUAUAUAUAUAU 3'
When he analyzes the polypeptides produced, he finds that:
X produces a polypeptide that is 50% phenylalanine and 50%lysine.
Y produces a polypeptide that is 50% phenylalanine and 50% proline.
Z produces a polypeptide that is 50% isoleucine and 50% tyrosine.
Based on these results only, the best conclusion to make is that

Question

Quizplus · Accepted Answer

The mRNA strand (x) contains the codons AAA and UUU. Since the polypeptide produced is 50% lysine and 50% phenylalanine, AAA must code for lysine and UUU for phenylalanine.

A Scientist Makes Three Artificial MRNA Strands