Polyribosomes are aggregates of:
Correct answer: D. Several ribosomes held together by a string of mRNA
- A. Ribosomes and rRNA
- B. Only rRNA
- C. Peroxisomes
- D. Several ribosomes held together by a string of mRNA
Explanation
Polyribosomes, also known as polysomes, are clusters of multiple ribosomes attached to a single mRNA molecule. This structure allows several ribosomes to simultaneously translate the mRNA sequence into polypeptide chains, thus enhancing the efficiency of protein synthesis. Option A and B are incorrect because they do not involve mRNA, which is essential for the structure and function of polyribosomes. Option C is incorrect as peroxisomes are separate organelles with different functions related to metabolism and do not participate in forming polyribosomes.
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