dna replication. nucleotides t.h. morgan genes are located on chromosomes
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T.H. Morgan Genes are located on chromosomesTRANSCRIPT
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DNA Replication
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Nucleotides
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T.H. MorganGenes are located on chromosomes
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Transformation (Griffith 1928)
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Avery, McCarty, MacLeod (1944)
Genetic MaterialProtein or DNA ????
"Studies on the chemical nature of the substance inducing transformation of pneumococcal types"
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Phages
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Hershey & Chase (1952)
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Linus Pauling (1948)Alpha Helix Structure
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Chargaff’s RuleAdenine – ThymineGuanine - Cytosine
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Watson & Crick
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Maurice WilkinsX-ray diffraction
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Rosalind Franklin
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Nucleotides
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X-ray Data
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DNA Structure
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Complimentary Strands
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Semiconservative Model
(Meselson & Stahl)
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Semiconservative Model(Meselson & Stahl)
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Origin of Replication
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DNA Nucleosides Triphosphates
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Antiparallel
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EnzymesDNA PolymeraseHelicaseSingle-strand binding proteinTopoisomeraseRNA primaseLigase
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RNA PrimerUses RNA primase to build RNA primerEventually replaced with DNA by DNA Polymerase
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DNA Replication
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Leading and Lagging StrandsLeading Strand
Built in the 5’-3’ directionBuilt toward the replication forkBuilt continuouslyUses one RNA Primer
Lagging StrandBuilt in the 5’-3’ directionBuilt away from the replication forkBuilt discontinuously using Okazaki fragmentsMany RNA Primers
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Overview
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ProofreadingMismatch RepairNucleotide Excision Repair (nucleases)
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End-replication ProblemNucleotides can only be added to 3’ end
Leaves gap on leading strand
Each replication causes DNA molecule to get smaller
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Telomeres
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TelomeresEnd of DNA strand made up of reoccurring DNA sequenceCan be rebuilt with telomerase (only in germ-line cells)