A Mutant Bacterial Cell Has a Defective Aminoacyl-TRNA Synthetase That

question 69

Multiple Choice

A mutant bacterial cell has a defective aminoacyl-tRNA synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine.What would be a potential consequence for a cell in which this happens? Remember that phenylalanine may be encoded by multiple codons.

• A)None of the proteins in the cell will contain phenylalanine.
• B)Proteins in the cell will include lysine instead of phenylalanine at amino acid positions specified by the codon UUU.
• C)The cell will compensate for the defect by attaching phenylalanine to tRNAs with lysine-specifying anticodons.
• D)The ribosome will skip a codon every time a UUU is encountered.

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