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BS110 Lecture 2 - What is the architecture of genetic...

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What is the architecture of genetic information? Jan 16, 2007 BioSci110
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DNA (Deoxyribonucleic acid) Macromolecule Several functions Long-Term storage of information: “blueprints” Control cells Can replicate Is copied to produce proteins Can mutate…
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DNA structure DNA molecule is shaped like a spiral staircase or twisted ladder. “The Double Helix” THE OUTER PARTS OF THE OF THE LADDER ARE MADE OF SUGARS. THE STEPS OF THE LADDER ARE MADE OF PAIRS OF NITROGEN BASES.
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Nucleotides that make up DNA have 3 components: Phosphate group 5-C sugar (deoxyribose) Nitrogen- containing organic base
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Four Bases of DNA Nucleotides Adenine (A) – purine Guanine (G) – purine Thymine (T) – pyrimidine Cytosine (C) - pyrimidine
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DNA bases
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Structure of DNA Nucleotides covalently bonded Sugar of nuc1 bonded to phosphate of nuc2 Read 5’ to 3’
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How is DNA stored? In Chromosomes Centromere
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The centromere It holds together the two similar halves of the chromosome, the sister chromatids.
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