DNA Structure: Double Helix

• Double Helix:

  • Antiparallel & Complementary
    • Erwin Chargaff base pairing

• B-DNA

  • 2 nm (20 A) wide
  • 3.4 nm (34 A) per turn
  • 10 bases per turn
  • 0.34 nm (3.4 A) between bases
  • Major Grove & Minor Grove

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