Quiz 1 key

Quiz 1 key - Quiz 1 Key, Biology 340, General Genetics,...

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Quiz 1 Key, Biology 340, General Genetics, Spring, 2008 Note – Information in [brackets] is not part of the answer needed for full credit, but is supplementary material to help you understand the material. 1. a) What are Chargaff’s Rules? Please be specific. b) Why was it important that he examined samples from many different species? c) How did his results help Watson and Crick determine a model for the structure of DNA? Please be specific. a) The amount of adenine is equal to the amount of thymine and the amount of cytosine is equal to the amount of guanine in DNA. [Note, he did not come up with the idea of complementary base pairing.] b) His results were consistent from species to species and from cell type to cell type, that is, his rules apply to all species. If he had only looked at a few species his results could have been attributed to something specific to that species or cell type. c) Watson and Crick were able to use that information to help come up with the idea of hydrogen bonding between adenine and thymine and between cytosine and guanine. This is termed complementary base pairing. It was very important that their model be consistent with all of the existing experimental data.
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Quiz 1 key - Quiz 1 Key, Biology 340, General Genetics,...

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