Polysomes...
A) are large cytoplasmic assemblies made of several ribosomes each translating their exclusive mRNA.
B) are only found in the eukaryotic cytoplasm.
C) can take advantage of the circularization of eukaryotic mRNA (by interactions between the 5' and 3' ends of the mRNA) to further speed up the rate of protein synthesis.
D) are mostly translationally inactive and are normally used by the cell to store the ribosomes and their associated mRNAs for future use.
E) All of the above.

Question

Quizplus · Accepted Answer

Polysomes form as a result of frequent initiation events leading to several ribosomes bound to and translating each mRNA simultaneously. If the mRNA is circularized, the ribosomes that have finished the synthesis of the protein can reinitiate immediately for another round.