Nucleus
Within an interphase nucleus, the densely staining region that is the principal site for synthesis and assembly of ribosomal RNA is called what?
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About This Question
- Subject
- biology
- Chapter
- cell structure and function
- Topic
- nucleus
- Difficulty
- Easy
- Year
- 2025
Solution
Correct Answer:
Nucleolus
The nucleus contains a ground substance and one or more spherical, densely staining bodies that are not bounded by any membrane. This body, the nucleolus, is the site of active ribosomal RNA synthesis and the assembly of ribosomal subunits, a role described in NCERT Class 11, Chapter 8 (Cell: The Unit of Life); cells engaged in vigorous protein synthesis usually possess large or multiple nucleoli. The nuclear envelope is incorrect because it is the double membrane that separates the nuclear contents from the cytoplasm and merely controls exchange across the boundary. Nucleoplasm refers to the transparent, semi-fluid matrix of the nucleus in which the chromatin and the nucleolus are suspended, so it is the medium rather than the rRNA factory. The nuclear pore complex consists of openings in the envelope that regulate the movement of molecules between nucleus and cytoplasm, again unrelated to rRNA production. A logical consistency check confirms the answer: ribosomal subunits must be assembled before export to the cytoplasm, and the structure dedicated to that task is the nucleolus.
This easy difficulty biology question is from the chapter cell structure and function, covering the topic of nucleus. It appeared in the 2025 exam.
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