Question:
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
Many ribosomes may associate with a single mRNA to form multiple copies of a polypeptide simultaneously. Such strings of ribosomes are termed as
Updated On: Apr 23, 2026
- Polysome
- Plastidome
- Polyhedral bodies
- Nucleosome
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The Correct Option is A
Solution and Explanation
The question pertains to the association of ribosomes with a single mRNA strand to synthesize polypeptides. When multiple ribosomes concurrently translate a single mRNA molecule, they form a structure known as a "polysome" or "polyribosome."
- Understanding the term 'Polysome':
- A polysome is a complex of an mRNA molecule with two or more ribosomes that are translating it.
- This allows multiple copies of a polypeptide to be synthesized simultaneously from the same mRNA strand, significantly enhancing the efficiency of protein synthesis.
- Explanation of Options:
- Polysome: As explained, it refers to a group of ribosomes reading a single mRNA strand.
- Plastidome: Refers to a group of plastids within a cell. It is unrelated to mRNA and ribosomes.
- Polyhedral bodies: These are protein bodies found in certain cells, not related to ribosomes or mRNA.
- Nucleosome: It is a segment of DNA wound around histone cores, integral to chromatin structure—not related to the translation process involving ribosomes.
- Conclusion: By understanding the definitions and functions of these terms, we identify "Polysome" as the correct answer because it directly describes the structure made by the group of ribosomes translating a single mRNA strand.
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