BIOL 1001March 12

BIOL 1001March 12 - BIOL 1001 March 12, 2010 Chapter 9:...

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BIOL 1001 March 12, 2010 Chapter 9 : DNA: molecule of Heredity What is the structure of DNA? Nucleotide structure: 3 parts The 4 nucleotides of DNA: Thymine Cytosine Adenine Guanine Base pairing in DNA: 1. Adenine and Thymine always form pairs - Two H bonds 2. Guanine and Cytosine always form pairs - 3 H bonds The Watson Crick Model of DNA Structure DNA is a double helix of two nucleotide strands Complementary base pairs hold the two DNA strands together Complementary strands run in opposite directions X-Ray Diffraction of DNA Maurice Wilkins & Rosalind Franklin knew that DNA formed a helix by the patterns seen in X-ray diffraction The discovery of DNA: Pauling Wilkins and Franklin Watson and Crick Model of DNA Why is DNA important? The order of nucleotides in a DNA molecule can encode a large amount of information - Computers: 0&1 codes for everything - DNA: A, T, C, and G code for everything - DNA 10 nucleotides long has 4 10 different possible combinations;
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BIOL 1001March 12 - BIOL 1001 March 12, 2010 Chapter 9:...

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