Choose incorrect sentence.

• A

  $A$ typical nucleosome contains $200$ bp of $DNA$ helix.

• B

  Nucleosomes constitute the repeating unit of a structure in nucleus called chromatin thread like stained (coloured) bodies seen in nucleus

• C

  In a typical nucleus, some region of chromatin are loosely packed and are referred to heterochromatin.

• D

  Euchromatin is said to be transcriptonally active chromatin, whereas heterochromatinis inactive.