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Opener: What controls all cell activities and determines our features?

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Presentation on theme: "Opener: What controls all cell activities and determines our features?"— Presentation transcript:

1 Opener: What controls all cell activities and determines our features?

2 Bacteriophage with phosphorus-32 in DNA Phage infects bacterium Radioactivity inside bacterium Bacteriophage with sulfur-35 in protein coat Phage infects bacterium No radioactivity inside bacterium Alfred Hershey and Martha Chase’s experiment Section 12-1 Go to Section:

3 Bacteriophage with phosphorus-32 in DNA Phage infects bacterium Radioactivity inside bacterium Bacteriophage with sulfur-35 in protein coat Phage infects bacterium No radioactivity inside bacterium Hershey-Chase Experiment Section 12-1 Go to Section:

4 Bacteriophage with phosphorus-32 in DNA Phage infects bacterium Radioactivity inside bacterium Bacteriophage with sulfur-35 in protein coat Phage infects bacterium No radioactivity inside bacterium Hershey-Chase Experiment Section 12-1 Go to Section:

5 Rosalyn Franklin Her work was used by James Watson and Francis Crick to figure out the structure of DNA

6 Percentage of Bases in Four Organisms Section 12-1 Source of DNAATGC Streptococcus Yeast Herring Human Streptococcus Yeast Herring Human Go to Section: Chargaff’s Rule!

7 James Watson and Francis Crick

8 PurinesPyrimidines AdenineGuanine CytosineThymine Phosphate group Deoxyribose DNA Nucleotides Section 12-1 Go to Section:

9 Hydrogen bonds Nucleotide Sugar-phosphate backbone Key Adenine (A) Thymine (T) Cytosine (C) Guanine (G) Structure of DNA Section 12-1 Go to Section:

10 DNA Replication Section 12-2 Go to Section: Growth Replication fork DNA polymerase New strand Original strand DNA polymerase Nitrogenous bases Replication fork Original strand New strand

11 THE DNA SONG!! To the tune of “Row, row your boat” –We love DNA Made of nucleotides. Sugar, phosphate and a base Bonded down one side. –Adenine and thymine Make a lovely pair. Cytosine without guanine Would feel very bare.


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