Lecture6_08_Handouts

Lecture6_08_Handouts - Lecture 6 September 11, 2008 DNA and...

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± 1 Lecture 6 – September 11, 2008 DNA and Chromosomes The Nucleus Contains molecules of DNA, long polymers that encode the genetic information of the organims Genes are carried on chromosomes , which become visible as cells prepare to divide 1
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± 2 A DNA molecule consists of two complementary chains (or strands) of nucleotides Nucleotide : five-carbon sugar (deoxyribose) attached to a nitrogen-containing base and one or more phosphate groups G = Guanine C = Cytosine A = Adenine T = Thymine The way in which nucleotide subunits are linked together gives a DNA strand a chemical polarity: 5’ phosphate and 3’ hydroxyl Hydrogen bonds form efficiently only between A and T and between G and C 2
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± 3 Complementary base-pairing : a two-ring base (a purine) is always paired with a single-ring base (a pirimidine) DNA structure - Summary 3
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± 4 The DNA ‘message’ contains the information to make proteins. Genes are the functional units of heredity
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Lecture6_08_Handouts - Lecture 6 September 11, 2008 DNA and...

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