Ncvps bcr dna structure

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Ncvps bcr dna structure

  1. 1. The structure of DNA
  2. 2. Watson & Crick <ul><li>James Watson and Francis Crick described the structure of the DNA molecule as a double helix </li></ul><ul><li>Their work was aided by pictures of the DNA molecule taken Rosalind Franklin . </li></ul><ul><li>In 1962 Crick & Watson received the Nobel Prize for their pioneering work on the structure of the DNA molecule. </li></ul>
  3. 3. DNA- The molecule of Heredity <ul><li>We have already learned a little on DNA </li></ul><ul><ul><li>We know it is a complex polymer called a nucleic acid </li></ul></ul><ul><ul><li>We know that nucleic acids are made up of smaller base units called nucleotides. </li></ul></ul>
  4. 4. DNA nucleotides <ul><li>A DNA nucleotide is made up of three main parts </li></ul><ul><ul><li>Deoxyribose (simple sugar) </li></ul></ul><ul><ul><li>Phosphate group </li></ul></ul><ul><ul><li>Nitrogen base </li></ul></ul><ul><ul><ul><li>There are 4 bases </li></ul></ul></ul><ul><ul><ul><ul><li>Adenine – A </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Cytosine- C </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Thymine- T </li></ul></ul></ul></ul><ul><ul><ul><ul><li>Guanine- G </li></ul></ul></ul></ul>
  5. 5. DNA Bases <ul><ul><li>Adenine (A) pairs with Thymine (T) </li></ul></ul><ul><ul><li>Guanine (G) pairs with Cytosine (C) </li></ul></ul>
  6. 7. Chains of Nucleotides <ul><li>In DNA nucleotides do not exist as individual molecules </li></ul><ul><ul><li>Many nucleotides are connected to make nucleic acids </li></ul></ul><ul><li>Nucleotides combined to form two long chains (making one molecule) </li></ul><ul><li>Each chain of nucleotides contains single nucleotides connected to each other </li></ul>
  7. 8. Structure of DNA <ul><li>Chain of nucleotides, the sugar of one nucleotides is joined to the phosphate group of the next nucleotide by a covalent bond. </li></ul><ul><li>The two chains of nucleotides in a DNA molecule are held together by hydrogen bonds between the bases. </li></ul><ul><li>This pairing produces a long, two stranded molecule . The sides of the ladder are formed by the sugar and phosphate units, while the rungs of the ladder are the pairs of bases. </li></ul><ul><li>Not only is the DNA molecule in the form of a ladder but it is twisted into a double helix. </li></ul>

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