Aminoacyl-trna synthetases recognize their specific amino acid by and recognize the trnas that carry it by the

Aminoacyl-tRNA synthetases recognize their specific amino acid by charge, size and R group and recognize the tRNAs that carry it by the nucleotide sequence .

Aminoacyl-tRNA synthetases are enzymes that attaches the appropriate amino acids on to its tRNA . These are also responsible for performing the first step of protein synthesis.

b. regulated is the actual answer to your question.

explanation:

answer; i believe its echoic memory,it is believed to last three to four seconds; good luck