A Scientist Makes Three Artificial MRNA Strands

question 41

Multiple Choice

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

• A)AUA codes for isoleucine
• B)AAA codes for phenylalanine
• C)AAA codes for lysine
• D)AAA codes for lysine and AUA codes for isoleucine
• E)AAA codes for phenylalanine and AUA codes for isoleucine

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