Question

Part A Which of the following statements is NOT true of aminoacyl-tRNA synthetases? They activate the amino acid and covalently bond it to the mature tRNA. They attach the amino acid to the CCA at the 3'-end of the mature tRNA. They attach the amino acid to the elongating peptide and catalyze translocation. Each member of this protein family is dedicated to one particular amino acid. They are primarily responsible for the accuracy of mRNA translation Submit Request Answer Provide Feedback

Answer 1

Answer: Aminoacyl-tRNA synthetases is an enzyme that catalyzes the covalent attachment of aminoacids to the CCA at the 3'-end of the marure tRNA molecules. Each aminoacid has a unique aminoacyl-tRNA synthetase. Hence, there 20 aminoacyl-tRNA synthetases to 20 amino acids. They are responsible for accuracy of the translation process. So, the statements A, B, D and E are true. Peptidyl transferase enzyme catalyze the attachment of amino acid to the elongating peptide chain and catalyze translocation. Hence, the statement "Aminoacyl-tRNA synthetase attach the amino acid to the elongating peptide and catalyze translocation" is not true. The correct answer for this question is option C.