AP Biology Quiz
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GENE EXPRESSION AND REGULATION
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A researcher compares translation of two mRNAs that differ only in the position of a stop codon. mRNA X: 5′-AUG AAA UAA GGG-3′. mRNA Y: 5′-AUG AAA GGG UAA-3′. In both cases, AUG recruits the initiator tRNA, and UAA is recognized by a release factor that triggers polypeptide release. The ribosome translates codons sequentially from 5′ to 3′ until it reaches a stop codon. Which outcome is most likely when comparing the two polypeptides?
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