Gene Regulation: Operons and Epigenetics · Zoology

An operon is best defined as:

  1. A single gene with its own promoter
  2. A set of co-regulated genes
  3. A trans-acting regulatory protein
  4. A eukaryotic chromosome domain
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Correct answer: A set of co-regulated genes

An operon is a unit of gene expression in prokaryotes consisting of two or more functionally related structural genes transcribed as a single mRNA, controlled by a shared promoter and operator. The lac and trp operons are classic examples.

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