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Polyribosomes are aggregates of

1. ribosomes and rRNA
2. only rRNA
3. peroxisomes
4. several ribosomes held together by string of mRNA

Correct answer: several ribosomes held together by string of mRNA

Solution

Polyribosomes (polysomes) are formed when several ribosomes attach to a single mRNA molecule and translate it simultaneously. This arrangement increases protein synthesis efficiency.

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