AP Biology Quiz
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GENE EXPRESSION AND REGULATION
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A eukaryotic gene's coding DNA (template strand) includes the triplet 3′-TAC-5′, which is transcribed into mRNA codon 5′-AUG-3′ (start). A point mutation changes the template triplet to 3′-TAT-5′, producing mRNA 5′-AUA-3′ at the same position. Translation initiates at the first AUG encountered by the ribosome during scanning. No other mutations occur, and the next AUG in the mRNA is 60 nucleotides downstream in the same reading frame. Which outcome is most likely for the protein produced from the mutated mRNA?
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