Explain the role of aminoacyl-tRNA synthetases in translation fidelity.

• A. They charge tRNAs with their corresponding amino acids; accuracy ensures proper codon-anticodon pairing; editing activity can remove incorrect amino acids.
• B. They catalyze peptide bond formation in the ribosome.
• C. They unwind mRNA during translation.
• D. They synthesize tRNAs de novo.

Answer: (A)