A Mutant Bacterial Cell Has a Defective Aminoacyl Synthetase That

question 78

Multiple Choice

A mutant bacterial cell has a defective aminoacyl synthetase that attaches a lysine to tRNAs with the anticodon AAA instead of the normal phenylalanine. The consequence of this for the cell will be that

• 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.
• E) none of the options will occur; the cell will recognize the error and destroy the tRNA.

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