A Messenger RNA Consisting of a Single Triplet Repeated Over

question 21

Essay

A messenger RNA consisting of a single triplet repeated over and over again is expected to be translated in a test tube into three distinct polypeptides depending on exactly where translation begins under conditions where translation does not need to start at an AUG. A researcher translated the mRNA sequence 5'-GUAGUAGUA… -3' in a test tube and discovered only two polypeptides, namely polyvaline and polyserine. Explain where these polypeptides come from and why there are only two.

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