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Questions and Answers
What is the primary function of the nucleolus?
What is the primary function of the nucleolus?
- Ribosomal RNA production (correct)
- DNA replication
- Protein synthesis
- Lipid synthesis
Which of the following correctly describes the structural composition of the nucleolus?
Which of the following correctly describes the structural composition of the nucleolus?
- Bound by a double membrane
- Rich in lipids
- Composed of only protein
- Contains chromatin and RNA filaments (correct)
What are the two distinct regions of the nucleolus observed under electron microscopy?
What are the two distinct regions of the nucleolus observed under electron microscopy?
- Nuclear envelope and chromatin
- Nucleoplasm and chromatin
- Cytosol and nucleoplasm
- Pars fibrosa and pars granulosa (correct)
Why is the nucleolus typically described as highly basophilic?
Why is the nucleolus typically described as highly basophilic?
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Which statement about the nucleolus is incorrect?
Which statement about the nucleolus is incorrect?
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Study Notes
The Nucleolus
- The nucleolus is a spherical structure found in most cells.
- It is highly basophilic, meaning it stains easily with basic dyes.
- The nucleolus is not surrounded by a membrane.
- Under an electron microscope, the nucleolus has two distinct regions:
- Pars fibrosa (central fibrous area): Contains chromatin and RNA filaments
- Pars granulosa (outer granular portion): Composed of granules.
- Ribosomal RNA (rRNA) is produced within the nucleolus.
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