Protein Synthesis
The growing polypeptide chain is released from the ribosomes when

a chain terminating codon is reached
the 7-methyl guanosine cap is reached
the poly A tail is reached
a chain terminating tRNA binds to the ribosome

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Protein Synthesis
Translation in prokaryotes begins by the formation of a 30S initiation complex between the

30S ribosomal subunit, mRNA and initiation factors
30S ribosomal subunit, tRNA and initiation factors
30S ribosomal subunit and mRNA only
30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA

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