What would be the consequence of a mutation in a bacterial cell that produces a defective aminoacyl-tRNA synthetase that attaches a lysine instead of the normal phenylalanine to tRNAs with the anticodon AAA?
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.

Question

Quizplus · Accepted Answer

The defective aminoacyl-tRNA synthetase will attach a lysine instead of phenylalanine to tRNAs with the anticodon AAA. This means that the ribosome will incorporate lysine instead of phenylalanine at amino acid positions specified by the codon UUU, which is coded by the AAA anticodon. This will result in the production of abnormal proteins with lysine instead of phenylalanine at those particular positions.

What Would Be the Consequence of a Mutation in a Bacterial