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DNA structure and types
DNA structure and types
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DNA Types

  1. 1. DNA Types By Pankaj Kukreti
  2. 2. What Is DNA ? • Deoxyribonucleic acid (DNA) is a molecule that encodes the genetic instructions used in the development and functioning of all known living organisms and many viruses.
  3. 3. A-DNA Right-handed double helix  Base Pair along axis 2.4 Å
  4. 4. A-DNA Upper View Diameter 23 Å (2.3 nm) Turn of helix 24.6 Å
  5. 5. B-DNA Right-handed double helix  Base Pair along axis 3.4 Å
  6. 6. B-DNA Upper View Diameter 20 Å (2.0 nm) Turn of helix 33.2 Å (3.32 nm)
  7. 7. Z-DNA Left-handed double helix Base Pair along axis 3.7 Å
  8. 8. Z-DNA Upper View Diameter 18 Å (1.8 nm) Turn of helix 45.6 Å (4.56 nm)
  9. 9. C-DNA Right handed double helix Having relatively low humidity
  10. 10. C-DNA Upper View Presence of certain ions like Li+ or Mg2+
  11. 11. 1. These are Those DNA In Which Both End are Free 2. Present in Nucleus of Eukaryotic Cell Linear DNA
  12. 12. Circular DNA 1. DNA Which Doesn’t have Free End 2. These DNA Present In Nucleoid Region Of Prokaryotic Cell
  13. 13. Trophic & Genetic DNA In Some Animal Like Paramecium .There Are Two Type Of DNA Found Trophic (Macro) & Genetic (micro) DNA
  14. 14. Genetic DNA Genetic DNA Present In Micro-nucleus & Transfer From One Generation To another Generation
  15. 15. Trophic DNA Trophic DNA Present In Macronucleus & Not Tranfer From One generation To another

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