DNA

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Structure of DNA

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DNA

  1. 1. DNA Blueprint of Life
  2. 2. DNA <ul><li>DNA: Deoxyribonucleic Acid </li></ul><ul><ul><li>D = deoxyribo </li></ul></ul><ul><ul><li>N = nucleic </li></ul></ul><ul><ul><li>A = acid </li></ul></ul><ul><li>DNA is found in genes on chromosomes in the n ucleus of cells. </li></ul><ul><li>Humans have 46 chromosomes, 23 pairs of chromosomes </li></ul>
  3. 3. DNA Function <ul><li>The chemical basis of life </li></ul><ul><li>The unit of heredity material </li></ul><ul><li>Chromosomes are made of genes and genes are made of DNA </li></ul><ul><li>Carries the genetic code for building an organism </li></ul>
  4. 4. DNA Structure <ul><li>Watson and Crick (1953) discovered the structure of DNA </li></ul><ul><ul><li>Rosalind Franklin </li></ul></ul><ul><li>Components: Nucleotides </li></ul><ul><ul><li>Sugar (deoxyribose) </li></ul></ul><ul><ul><li>Phosphate group </li></ul></ul><ul><ul><li>Nitrogen Base </li></ul></ul><ul><ul><ul><li>A = Adenine </li></ul></ul></ul><ul><ul><ul><li>G = Guanine </li></ul></ul></ul><ul><ul><ul><li>C = Cytosine </li></ul></ul></ul><ul><ul><ul><li>T = Thymine </li></ul></ul></ul>A – T G - C
  5. 5. DNA <ul><li>DNA consists of two strands of twisted nucleotides called a “DOUBLE HELIX” </li></ul>
  6. 6. DNA <ul><li>Each nucleotide contains a SUGAR, a PHOSPHATE GROUP, and a NITROGEN BASE. </li></ul><ul><li>The SUGAR and the PHOSPHATE form the backbone. </li></ul><ul><li>The NITROGEN bases pair up in the middle. </li></ul><ul><li>Hydrogen Bonds hold the strand together. </li></ul>
  7. 7. DNA Structure

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