4. Transformed Bacteria Mouse injected w/bacteria Results Conclusions R strain does not cause pneumonia S strain does cause pneumonia Heat-killed S strain does not cause pneumonia Substance from heat-killed S strain can transform harmless R strain into deadly S strain
21. The Watson-Crick Model of DNA Structure Hydrogen bonds form between complementary bases Complementary base pairs hold the two DNA strands together DNA is a double helix of two nucleotide strands
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30. The Semiconservative Replication Model One DNA double helix Duplicated Chromosome Chromosome Daughter chromosomes half old , half new Both strands of original DNA serve as templates Sister Chromatids
31. Replication Bubble Replication forks move in opposite directions Replication Forks Replication Bubble Parental Daughter DNA replication begins DNA replication progresses DNA replication completed