DNA storage

• DNA is kept in the nucleus

  transcription also occurs in the nucleus
• DNA is bound to histone proteins

  DNA + histone proteins = chromatin
• EUCHROMATIN

  • loosely packed
  • appears lighter
  • easier for RNA polymerase to attach for transcription
• EUCHROMATIN


  • more ACETYL groups
  • groups are negative
  • they REPEL
  • results in loose packing
• HETEROCHROMATIN


  • densely packed
  • appears darker
  • harder for RNA polymerase to attach for transcription
• HETEROCHROMATIN


  • more METHYL groups
  • groups are hydrophobic
  • they clump together
  • results in dense packing