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Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
Structure of dna
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Structure of dna

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  • The illustration is a ‘model’ of the double helix forming part of a DNA molecule (Slide 14)
  • Cornell Notes:
  • It is the phosphate group which gives DNA its acidic properties
  • Transcript

    • 1. Structure of DNA 1
    • 2. What is DNA? • DNA stands for deoxyribose nucleic acid It’s a macromolecule found in the nucleus of all cells in all living organisms • The kind of cell which is formed, (muscle, blood, nerve, etc) is controlled by DNA • The kind of organism which is produced (dog, giraffe, frog, human, etc) is controlled by DNA 2
    • 3. What is a DNA molecule? • DNA is a very large molecule made up of a long chain of sub-units • The sub-units, or monomers, are called nucleotides • Each nucleotide is made up of: -a sugar called deoxyribose -a phosphate group -PO 4 and -A base (Adenine, Guanine, Cytosine or Thymine) 3
    • 4. What are the 4 bases? The four bases are: 5 Adenine (A) Thymine (T) Cytosine (C) Guanine (G)
    • 5. What forms a nucleotide? The deoxyribose, adenine Deoxyribose (sugar) PO 4 the phosphate and one of the 4 bases combine to form a nucleotide: 6 (base)
    • 6. How do nucleotides form a strand of DNA? • A molecule of human DNA is formed by billions of nucleotides joined together in a long chain sugar-phosphate backbone + bases 7 • In fact, the DNA consists of a double strand of nucleotides PO 4 PO 4 PO 4 PO 4
    • 7. 2-stranded DNA 9 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4 PO 4
    • 8. How do bases pair together? The bases always pair up in the same way Adenine forms a bond with Thymine and Cytosine bonds with Guanine 10 Adenine Thymine Cytosine Guanine
    • 9. Bonding 2 11 PO 4 PO 4 PO 4 thymine PO 4 PO 4 PO 4 PO 4 adenine cytosine PO 4 guanine
    • 10. The paired strands are coiled into a spiral called A DOUBLE HELIX (or TWISTED LADDER) 13 What is the structure of DNA called?
    • 11. • The DNA of humans is composed of approximately 3 billion base pairs. • If you stretched out the DNA in every cell, it would be almost a meter long! Cool Facts!!!!!

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