Biology Exploring Study Set 1

Biology

Quiz 8 :

Genetic Recombination

Quiz 8 :

Genetic Recombination

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Which type of DNA is transferred as a result of conjugation involving an Hfr strain of E. coli?
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B

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By which molecular process do non-infective strains of bacteria acquire genes from infectious strains?
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C

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What is the name of the small circles of DNA that occur in bacteria in addition to the main circular chromosomal DNA molecule?
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C

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"Met" refers to a gene that governs a cell's ability to synthesize methionine from inorganic precursors. What does the designation "met-" indicate?
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What is identified through the technique of replica plating?
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How many recombination events result from cutting and pasting four DNA backbones?
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"Bio" refers to a gene that governs a cell's ability to synthesize biotin from inorganic precursors. What does the designation "bio+" indicate?
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Suppose that two strains of E. coli - strain a (bio- met- leu+ thr+ thi+) and strain b (bio+ met+ leu- thr- thi-) - conjugate. If the two strains are grown on minimal medium, what is the most likely genotype of their offspring?
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During conjugation, which cells are the recipients of the exogenous DNA?
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"Leu" refers to a gene that governs a cell's ability to synthesize leucine from inorganic precursors. What does the designation "leu-" indicate?
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During bacterial conjugation, bacterial DNA with different alleles get together. What is the name of the long tubular structure that bacteria use to obtain differing alleles?
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Which sentence best describes what occurs during bacterial transformation?
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Which sentence best describes what occurs during bacterial conjugation?
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What is the purpose of the sex pilus?
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Which term refers to media that contain water, organic carbon sources, and salts, but no extra nutritional components?
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What type of genetic recombination results from the mating of two strains of bacteria F+ and F-?
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Hfr cells can integrate the F factor and some genes into the bacterial chromosome. How do Hfr cells accomplish this?
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Which genetic factor confers upon bacteria the ability to undergo conjugation?
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Suppose that a researcher is looking for met- strains of E. coli. She compares two plates. One plate has colonies growing on complete media. The other plate has colonies growing on methionine-deficient media. How can the researcher determine which colonies are met-?
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"Thr" refers to a gene that governs a cell's ability to synthesize threonine from inorganic precursors. What does the designation "thr+" indicate?
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