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

a chain terminating tRNA binds to the ribosome
a chain terminating codon is reached
the poly A tail is reached
the 7-methyl guanosine cap 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, mRNA and initiation factors
30S ribosomal subunit, tRNA and initiation factors
30S ribosomal subunit, mRNA, initiation factors and N-fMet tRNA
30S ribosomal subunit and mRNA only

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Protein Synthesis
The first step in translation is

binding of mRNA to the small ribosomal subunit
binding of the two ribosomal subunits to each other
binding of mRNA to the two ribosomal subunits
binding of tRNA to the small ribosomal subunit

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