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

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

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

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

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