exam 3 (mean 76%)
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Exam 3 (mean 76%). Today-Ch 13 Announcements Look for Chapter 12 and 13 quizzes posted this weekend. Exam 4 covers Chapters 12, 13 and 16 (last exam you can drop. Everyone must take the final exam). Biology 190 Chapter 16 pictures. DNA Replication occurs at the “S” stage of mitosis. - PowerPoint PPT PresentationTRANSCRIPT
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Exam 3 (mean 76%)
A 70-63
B 62-56
C 55-49
D 48-42
F 41-0
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• Today-Ch 13
• Announcements – Look for Chapter 12 and 13 quizzes
posted this weekend.– Exam 4 covers Chapters 12, 13 and 16 (last
exam you can drop. Everyone must take the final exam)
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Biology 190Chapter 16 pictures
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DNA Replication occurs at the “S” stage of mitosis
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Fig 5.26 Nucleotides
U
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ACCCCAG
Fig 16.5 One DNA strand.
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Fig 16.6 Double HelixACCCCAG
-T-G-G-G-G-T-C
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Chargaff’s Rule
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Question 16.1
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Functions of Proteins
• Structural• Catalytic activity• Immunity• Regulation • Poisons• Transport molecules• Hormones• Fluid and electrolyte balance • Sources of energy
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Fredrick Griffith’s Experiments
Polysaccharide Coat
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Fredrick Griffith’s Results
Live R-strainpicked up DNA from the S-strain. Contains genes for “smooth coat”.
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Alfred Hershey and Martha Chase
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How viruses (phages) infect bacteria
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Fig 16.4 Hershey and Chase
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Watson and Crick
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Rosalind Franklin’s Data(Maurice Wilkins’ Lab)
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What exactly IS the structure of DNA?
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Chargaff’s Rule
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Nucleotide base pairing
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Fig 16.7 Structure of DNA
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Nobel Prize- 1962Wilkins Crick Watson
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Figure 16.9 Semiconservative Model for DNA Replication
Parental strands(template strands)
Daughter strands
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DNA Origin of Replication
Bacteria have one origin of replication.
Fig 16.12 Eukaryotic organisms have multipleorigins of replication.
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Unwinding DNA
Single-strandedBinding Proteins
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Nucleoside Triphosphate
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Fig 16.13 DNA Polymerase(Daughter strand) (Parent strand)
(Old strand)
P
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Questions 6.3 & 6.4
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Fig 16.14ReplicationFork
Leading Strand
5’
3’
Lagging Strand
5’
3’
5’
5’
5’
5’
3’
3’
3’
3’
5’
5’
3’
3’
Old strandsParent strandsTemplate strands
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Fig 16.14
DNA Ligase
DNA Polymerase III
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Fig 16.13 DNA polymerase needs a 3’ -OH group
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Fig 16.16
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Fig 16.16. Review of Bacterial DNA Replication
Helicase
SS bindingproteins
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Fig 16.18DNA shortening and telomeres
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Mismatch repair
2 Purines = bulge
2 Pyrimidines = dimpleT C
G A
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Fig 16.17 Excision Repair
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Xeroderma Pigmentosa
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In very, very, vary rare cases mutations have a
selective advantage