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First ribosome reaches termination codon

More ribosomes attach to the 5' end of mRNA

Polyribosomal complex

■ Figure 3-9 Assembly of the small ribosome subunit with mRNA and then the large ribosomal subunit and charged tRNA initiates RNA synthesis (initiation). Binding of charged tRNAs and formation of the peptide bond produce the growing polypeptide (elongation). Several ribosomes can simultaneously read a single mRNA (polyribosome complex). When the complex encounters a nonsense codon, protein synthesis stops (termination), and the components are recycled.

More ribosomes attach to the 5' end of mRNA

Polyribosomal complex

■ Figure 3-9 Assembly of the small ribosome subunit with mRNA and then the large ribosomal subunit and charged tRNA initiates RNA synthesis (initiation). Binding of charged tRNAs and formation of the peptide bond produce the growing polypeptide (elongation). Several ribosomes can simultaneously read a single mRNA (polyribosome complex). When the complex encounters a nonsense codon, protein synthesis stops (termination), and the components are recycled.

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