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Polysome is formed by:

1. several ribosomes attached to a single mRNA
2. many ribosomes attached to a strand of endoplasmic reticulum
3. a ribosome with several subunits
4. ribosomes attached to each other in a linear arrangement

Correct answer: several ribosomes attached to a single mRNA

Solution

A polysome (polyribosome) is a cluster of ribosomes translating a single mRNA molecule at the same time. This increases protein production efficiency, so the correct choice is the one describing several ribosomes attached to one mRNA.

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