DNA

• How is DNA stored in prokaryotic and eukaryotic cells?

  Stored differently in prokaryotic and eukaryotic cells
• What is the structure of DNA in all organisms?

  The structure of DNA is the same
• What type of DNA do eukaryotic cells contain?

  Linear DNA molecules as chromosomes
• Where are chromosomes found in eukaryotic cells?

  In the nucleus
• Why must DNA be wound up in eukaryotic cells?

  To fit into the nucleus
• What proteins does DNA wind around in eukaryotic cells?

  Histone proteins
• What is the role of histone proteins in DNA storage?

  Support the DNA structure
• How is DNA organized in eukaryotic cells?

  Coiled tightly to form compact chromosomes
• What type of DNA do mitochondria and chloroplasts have in eukaryotic cells?

  • Circular DNA
  • Shorter than nuclear DNA
  • Not associated with histone proteins
• How do prokaryotic cells carry DNA?

  As shorter, circular chromosomes
• How is prokaryotic DNA condensed to fit in the cell?

  By supercoiling
• Compare the storage of DNA in eukaryotic and prokaryotic cells.

  Eukaryotic DNA:

  • Linear chromosomes
  • Wound around histones
  • Found in the nucleus

  
  

  Prokaryotic DNA:

  • Circular chromosomes
  • Condensed by supercoiling
  • Not associated with histones