If a bacteria contained a mutant aminoacyl-tRNA synthetase that attaches a lysine instead of the normal phenylalanine to tRNAs with the anticodon AAA which of the following would occur?
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 aminoacyl-tRNA synthetase is responsible for attaching the correct amino acid to its corresponding tRNA based on the anticodon. If it attaches lysine instead of phenylalanine to tRNAs with the anticodon AAA (which pairs with the codon UUU for phenylalanine), the ribosome will incorporate lysine instead of phenylalanine at positions where the mRNA has the codon UUU. This is because the ribosome does not directly recognize the amino acid but relies on the anticodon-codon pairing for the placement of amino acids during protein synthesis.

If a Bacteria Contained a Mutant Aminoacyl-TRNA Synthetase That Attaches