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20) In his transformation experiments, what did Griftith observe A) Mixing a heat-killed pathogenic strain of bacteria with a living nonpathogenic strain can convert some of the living cells into the pathogenic form B) Mixing a heat-killed nonpathogenic strain of bacteria with a living pathogenic strain m the pathogenic strain nonpathogenic C) Inf strains ecting mice with nonpathogenic strains of bacteria makes them resistant to pathogenic D) Mice infected with a pathogenic strain of bacteria can spread the infection to other mice. 21) How do we describe transformation in bacteria? A) the creation of a strand of DNA from an RNA molecule B) the creation of a strand of RNA from a DNA molecule C) the infection of cells by a phage DNA molecule D) assimilation of external DNA into a cell 22) After mixing a heat-killed, phosphorescent (light-emitting) strain of bacteria with a living, nonphosphorescent strain, you discover that some of the living cells are now phosphorescent. Which observation(s) would provide the best evidence that the ability to phosphoresce is a heritable trait? A) evidence that DNA was passed from the heat-killed strain to the living strain B) evidence that protein passed from the heat-killed strain to the living strain C) especially bright phosphorescence in the living strain D) phosphorescence in descendants of the living cells 23) In trying to determine whether DNA or protein is the genetic material, Hershey and Chase made use of which of the following facts? A) DNA contains sulfur, whereas protein does not. B) DNA contains phosphorus, whereas protein does not. C) DNA contains nitrogen, whereas protein does not. D) DNA contains purines, whereas protein includes pyrimidines. It became apparent to Watson and Crick after completion of their model that the DNA 24) molecule could carry a vast amount of hereditary information in which of the following? A) sequence of bases B) phosphate-sugar backbones C) complementary pairing of bases D) side groups of nitrogenous bases 25) In an analysis of the nucleotide composition of DNA, which of the following will be found? A) A C B) A G and C T C) A +C-G+ TExplanation / Answer
20)A Genetic material transferred from heat killed pathogenic bacteria to non pathogenic bacteria 21)D uptake of foreign DNA or plasmid by competent bacterial cells 22)A. DNA is the genetic material 23)B 24)A sequence which. Forms codon and which form amino acid 25)C chargaff rule
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