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Tutorial In Griffith's experiments, he found that "smooth" strains of the bacteria Streptococcus pneumoniae could on occasion generate "rough" strains when grown in culture (in vitro). |
Q1: Would you expect rough strains to be able to produce smooth strains under these in vitro conditions? Explain your reasoning. Q2: In Griffith's study, he found that dead smooth S. pneumoniae could transform living rough strains of S. pneumoniae when co-injected into a mouse (in vivo). Would another species of dead bacteria give the same result? Q3: Would you expect that the ability of cells to take up extracellular DNA is regulate (and evolvable) trait, and if so what conditions would favor such a trait? |
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