BIOL 1001 Chapter : Ch 11 13
Document Summary
Unit of inheritance: determine inheritable traits among individuals within a species. Stimulate immunity against disease-causing agent (bacteria, virus, or protist) Weak strain of agent -> can"t cause disease (avirulent) Killed agent -> disease-causing agent killed by heat or chemicals. Protects bacteria from being phagocytized by white blood cells. Isolated dna from s-strain and mixed with live r-strain. Heat-killed s-strain leaked out pieces of it"s genetic info. R-strain incorporated genetic info into it"s own chromosomes. If genetic info contained the genes that caused disease, then r-strain transformed into. Centrifuged sample to separate bacteriophage coats from bacteria. Labeled protein from bacteriophage not injected into bacteria. Proved that dna = genetic material in viruses. Dna of any given species contains equal amounts of adenine and thymine as well as equal amounts of guanine and cytosine. Pauling: determined proteins coil in single stranded helices. Wilkins and franklin: used x ray diffraction and determined: Watson and crick: proposed double helix structure of dna.
