BIOL 1001 Chapter : Chapter 11 Biology
Document Summary
Chapter 11: dna- molecule of heredity11/25/2013 10:48:00 pm. Genes and dna: genes, segments of dna, located on chromosomes, unit of inheritance, dna (deoxyribonucleic acid, molecule of heredity, blueprints for cells- contain genetic info. Destroyed dna bacterial functioned abnormally: hershey and chase (1950"s, studied bacteriophages ( bacteria eater ) Simple virus composed of dna and protein coat. Inject virus dna into bacteria bacteria synthesizes new viruses: labeled bacteriophage with: Radioactive sulfur protein coat labeled: combined bacteriophages with bacteria, measured levels of radioactivity. Labeled protein coat no radioactive bacteria: conclusion: dna = genetic instructions for viruses. Who discovered dna structure: 1940s and 50s, pauling, determined proteins coil in single stranded helices, wilkins and franklin, determined (using tray diffraction) Dna contains repeating subunits: watson and crick, proposed double helix. Single strand dna strand: polymer of nucleotides, sugar phosphate backbone, covalent bond between: Sugar of neighboring nucleotide: nitrogen bases extend outwards, nucleotides orient in same direction, results in different ends.
