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#Question id: 4132


In E. coli, aminoacyl-tRNA synthetases:

#Section 3: Genetics, Cellular and Molecular Biology
  1. activate amino acids in 12 steps

  2. are amino acid–specific; there is at least one enzyme specific for each amino acid.

  3. fall into two classes, each of which attaches amino acids to different ends of the tRNA.

  4. have no proofreading activities.


Answer:- Option(s): 4


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