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​ A polysome is ____. a. ​ the complex that adds a poly(A) tail onto an mRNA b. ​ an mRNA transcript to which multiple ribosomes are attached c. ​ the combination of a large and a small ribosomal subunit d. ​ the promoter assembly at the site of transcription initiation e. ​ the complex where mRNA splicing occurs

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Answer:b. ​ an mRNA transcript to which multiple ribosomes are attached

Explanation: polysome consist of mRNA complex and two or more ribosome coming together to translate mRNA into a polypetide or amino acid. It helps produce many polypeptide from a single mRNA.

Different ribosomes bind to the mRNA at different time elongating the polypeptide chain. We have the free( non-poly A ) and memberane bound (poly A) polysome.

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