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Acetylation of histone tails generally

  • A.has no effect on how DNA is packaged
  • B.removes the histones from the DNA entirely
  • C.loosens chromatin and promotes transcription
  • D.tightens chromatin and blocks transcription

Answer: C

Adding an acetyl group neutralises the positive charge on lysine, weakening the grip on the DNA. Enzymes that add and remove these groups are important drug targets in cancer treatment. Several inhibitors of histone deacetylases are now in clinical use.

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