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Unformatted text preview: Chapter 6 REVIEW QUESTIONS 1. Why is it easier to identify spontaneous mutations in bacteria than in most eukaryotes? a. They are expressed directly in descendant cells because bacteria are haploid. b. They can be induced via exposure to the bacteriophage T1. c.They are visible as color changes within a bacterial plaque. d. They occur at a much higher frequency. 2. True or false? An E. coli nutritional mutant is described as an auxotroph, which requires minimal medium with supplementation of an organic carbon source or inorganic ion for growth. 3. What limits bacterial growth within a medium culture? a. Carbon dioxide b. Nutrients and oxygen c.Physical space d. All of the above 4. Which of the following statements best describes Hfr bacteria? a. They are derived from F + bacteria. b. They function as the donor in crosses with F bacteria. c.They function as the donor only in crosses with F bacteria and are so called because they result in high frequency recombination. d. They are so called because they result in high frequency recombination. 5. What is a merozygote? a. A partially diploid bacterial cell b. A zygote formed from a bacteriophage and a bacterial cell c.The result of sexual reproduction between two bacteria cells d. A haploid bacterial cell 6. True or false? The fertility factor is a mobile genetic element called a plasmid that contains genes for directing gene transfer between bacterial cells. 7. Which of the following statements about cotransformation is true? a. Two bacterial cells within a culture are transformed by the same genetic material. b. It is not uncommon for the entire bacterial chromosome and F factor to be passed from one cell to another. c.Unlinked genes are passed simultaneously from one cell to another. d. A bacterial cell receives two adjacent genes on a single piece of DNA from the medium. 8. All of the following statements about bacteriophages are true except a. They use the metabolic machinery of a bacterial cell to produce more copies of themselves. b. They are viruses. c.They can pick up bacterial genes during the process of infecting a bacterial cell. d. Within their heads, they can pack the main chromosome from one cell and transfer it to another. 9. True or false? A plaque assay detects the number of bacterial auxotrophs on a plate. 10. Which of the following statements best describes lysogeny?...
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