Multiple choice

After the first tRNA anticodon attaches to the mRNA start codon, what happens next?

  1. The ribosome would move along the mRNA by one codon

  2. The amino acids join with a peptide bond

  3. The anticodon of another tRNA binds to the second mRNA codon

  4. The first tRNA detaches
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C Correct answer
Explanation

Once the initiator tRNA binds to the start codon, the next codon is exposed in the A site of the ribosome. The complementary anticodon of a second tRNA carrying its specific amino acid then binds to this second mRNA codon.

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