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Discussion

The A site of the ribosome is where ________.

  • A.the incoming aminoacyl-tRNA binds
  • B.the peptide chain is held during elongation
  • C.the uncharged tRNA exits
  • D.the mRNA is unwound

Answer: C

Correct answer: the incoming aminoacyl-tRNA binds

The ribosome has three tRNA sites: A for the arriving aminoacyl-tRNA, P for the tRNA holding the growing peptide, and E through which the discharged tRNA leaves. Each translocation step moves a tRNA one site along.

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