A Short Segment of an MRNA Molecule Is Shown Below

question 43

Multiple Choice

A short segment of an mRNA molecule is shown below.The polypeptide it codes for is also shown: 5′-AUGGUGCUGAAG-3′: methionine-valine-leucine-lysine
Assume that a mutation in the DNA occurs so that the fourth base (counting from the 5′ end) of the messenger RNA now reads A rather than G.What sequence of amino acids will the mRNA now code for? (You do not need a copy of the genetic code to answer the question.)

• A) methionine-valine-leucine-lysine
• B) methionine-lysine-leucine-lysine
• C) methionine-leucine-leucine-lysine
• D) methionine-valine-methionine-lysine
• E) methionine-methionine-leucine-lysine

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