Final answer:
Aminoacyl-tRNA synthetases are enzymes that match amino acids with tRNAs by adding the correct amino acid to the tRNA. They catalyze a bond between the tRNA and the amino acid. Each aminoacyl-tRNA synthetase is specific for one of the 20 amino acids.
Step-by-step explanation:
Aminoacyl-tRNA synthetases are enzymes that catalyze the addition of the correct amino acid to tRNA molecules. There is a different aminoacyl-tRNA synthetase for each tRNA, and each tRNA is specific for one of the 20 amino acids. The aminoacyl-tRNA synthetase matches up its specific amino acid with the tRNA by binding the amino acid to adenosine monophosphate (AMP) and then transferring it to the tRNA.