Nucleus: Structure, Chromatin, Nucleolus · Zoology

Which of the following is NOT a component of the nucleolus?

  1. Fibrillar center (site of rDNA transcription)
  2. Dense fibrillar component (early rRNA processing)
  3. Granular component (ribosome subunit assembly)
  4. Nuclear pore complexes
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Correct answer: Nuclear pore complexes

The nucleolus consists of three morphologically distinct regions: the fibrillar center (where rDNA is transcribed), the dense fibrillar component (where early rRNA processing occurs), and the granular component (where ribosome subunits are assembled). Nuclear pore complexes are embedded in the nuclear envelope and are entirely separate from the nucleolus.

Difficulty: Medium Question 9 of 20

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