Nucleus: Structure, Chromatin, Nucleolus · Zoology

The number of nucleoli in a nucleus is generally related to:

  1. Overall cell size
  2. Amount of heterochromatin
  3. Number of rRNA gene clusters
  4. Current stage of the cell cycle
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Correct answer: Number of rRNA gene clusters

Nucleoli form around nucleolar organizer regions, which contain clusters of rRNA genes. Cells with more rRNA gene clusters generally have multiple nucleoli to meet their ribosome production demands.

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