university of florida bsc2010 biology 1 ch17 slides

May 6th, 2015
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university of florida bsc2010 biology 1 ch17 slides

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BSC2010 LectureCh 16-17For a couple of decades, biologists knew the nucleuscontained DNA and proteins. The prevailing opinion wasthat the genetic material was proteins, and not DNA. Thereason for this belief was that proteins are more complexthan DNA. What was the basis of this thinking?A) Proteins have a greater variety of three-dimensional formsthan does DNA.B) Proteins have two different levels of structural organization;DNA has four.C) Proteins are made of 40 amino acids and DNA is made offour nucleotides.D) Some viruses only transmit proteins.E) A and B are correct.In his transformation experiments,what did Griffith observe?A) Mutant mice were resistant to bacterial infections.B) Mixing a heat-killed pathogenic strain of bacteria with aliving nonpathogenic strain can convert some of the livingcells into the pathogenic form.C) Mixing a heat-killed nonpathogenic strain of bacteria with aliving pathogenic strain makes the pathogenic strainnonpathogenic.D) Infecting mice with nonpathogenic strains of bacteriamakes them resistant to pathogenic strains.E) Mice infected with a pathogenic strain of bacteria canspread the infection to other mice.Fig. 16-2Mixture ofheat-killedLiving S cells Living R cells Heat-killedS cells and(control)(control)S cells (control) living R cellsEXPERIMENTRESULTSMouse dies Mouse healthy Mouse healthyMouse diesLiving S cellsIn trying to determine whether DNA orprotein is the genetic material, Hers

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