Protein Synthesis
A polysome could be best described as

an active site of protein synthesis.
an active site of lipid synthesis.
All of these
an active site of DNA synthesis.

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Protein Synthesis
The first step in translation is

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

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