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10 Cards in this Set
- Front
- Back
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What is the 2 methods in which genetic info is changed in bacteria?
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First: Mutation
Second: Bacterial recombination |
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Define bacterial recombination
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Microorganisms exchange genetic material information among themselves to create new combinations of genes
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What is the 3 methods of bacterial recombination from the most common to the least common
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-Conjugation (most common)
-Transformation (2nd most common) -Transduction (least common) |
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Define conjugation
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Transfer of genetic info from living cell to another living cell through a pili
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Define Transformation
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Transfer of naked and free DNA from a dead cell (lysis) to a living cell (no pili)
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Define Transduction
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Transfer of genetic material (ie. small fragments of DNA) from one cell to another cell using a phage (virus) as a vector
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Who was the first to perform the experiment on transformation?
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Griffith (1928)
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What was the results of Griffith's experiment
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Encapsulated heat-killed bacteria (non-virulent) transferred naked and free DNA with capsule gene to non-encapsulated living bacteria
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What is the characteristic of conjugation?
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-Most common
-Req. direct cell to cell contact -Formation of pili (conjugation tube) -Species specific but interspecies is not uncommon (ie. genus-genus) |
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Who was the first to perform the experiment on conjugation?
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Lederberg and Tatum (1946)
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