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Stack #28239
Ch. 9 DNA: The Genetic Material- person/s & their discoveries
Person/s | Discoveries |
---|---|
Griffith | trying to prepare pneumonia vaccine, bacteria enclosed in a capsule (S colonies) that protects them from body's defense system- making them virulent, bacteria not in capsule (R colonies) weren't harmful, discovered transformation through experiments. |
Avery | demonstrated that DNA is the material responsible for transformation. |
Watson and Crick | determined DNA molecule is double helix, determined purine on one strand pairs w/ pyrimidine on other, A with T, C with G, 2 strands that contain complementary base pairs, one strand of DNA serves as a template or pattern on which other strand is built. |
Chargaff | for each organism studied, the amount of A always equaled the amount of T and the amount of C always equaled the amount of G, and the amount of A, T, C, and G varies in different organisms. |
Wilkins & Franklin Photographs | high-quality X-ray diffraction photos of strands of DNA, suggest DNA molecule resembled tightly coiled molecule made of 2 or 3 chains of nucleotides. |