Multiple choice

Once there two tRNA molecules attach to the mRNA, what happens?

  1. The ribosome moves along the mRNA by one codon

  2. The first tRNA detaches

  3. The ribosome detaches

  4. A peptide bond is formed between the amino acids on the tRNA
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D Correct answer
Explanation

When two tRNA molecules are bound to adjacent codons on the mRNA within the ribosome, the amino acids they carry are positioned close together. An enzyme in the ribosome then catalyzes the formation of a peptide bond between these amino acids to grow the polypeptide chain.

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