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Module 2

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Question
Answer
1a. Pathogen   show
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1b. Saprophyte   show
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show 1c. An organism that feeds on a living host.  
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show 1d. An organism that requires oxygen.  
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show 1e. An organism that does not require oxygen.  
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show 1f. A state in which members of a population die as quickly as new members are born.  
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show 1g. Population growth that is unhindered because of the abundance of resources for an ever-increasing population.  
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show 1h. Population growth that is controlled by limited resources.  
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1i. Conjugation   show
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1j. Plasmid   show
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show 1k. The transfer of a DNA segment from a nonfunctional donor cell to that of a functional recipient cell.  
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show 1l. The process in which infection by a virus results in DNA being transferred from one bacterium to another.  
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show 1m. The DNA and other essential parts of a bacterium coated with several hard layers.  
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1n. Strains   show
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show a.Plasma membrane b.Flagellum c.Capsule d.Deoxyribonucleic acid e.Cytoplasm f.Cell wall g.Fimbria h.Ribosome  
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show a.Plasma membrane-Wall of chemicals which regulate what the bacterium takes in from the outside world. b.Flagellum-Used for locomotion. c.Capsule-Adheres bacterium to surfaces. d.DNA-Contains all required information for life of the bacterium.  
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show e.Cytoplasm-Semifluid substance that supports the DNA and ribosomes. f.Cell wall-Holds the contents of the bacterium together. g.Fimbria-Fibrous bristles used for grasping. h.Ribosome-Makes proteins  
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4. What is the most popular means by which bacteria obtain food?   show
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show Heterotrophic because it feeds on a living host.  
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show A. DNA loop is attached to a point on the plasma membrane. B. The DNA is then copied. C. Cell wall elongates, separating the two strands of DNA. D. New cell wall material and plasma membrane begin to grow, closing the two strands off from each other.  
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6. (continued)   show
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7. A sample of food is dehydrated, which kills all of the bacteria. Then bacteria-free water is added to the food in a bacteria-free environment. Nevertheless, microscopic investigations indicate that bacteria are in the food. How did they get there?   show
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show Exponential growth.  
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9. A population of bacteria experiences logistic growth. What can you say about the resources of their environment?   show
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10. Even though genetic recombination among bacteria does not result in offspring, it can significantly affect the growth of the population. Why?   show
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show Coccus (spherical), bacillus (rod-shaped), and spirillem (helical).  
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12. A bacterium is heterotrophic and Gram-negative. To what phylum and class does it belong?   show
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show Phylum Firmicutes and class Thallobacteria.  
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14. A bacterium has no cell wall. To what phylum and class does it belong?   show
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show Phylum Mendosicutes and class Archaebacteria.  
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16. In the six-kingdom classification system, what replaces kingdom Monera?   show
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17. What conditions are ideal for most bacteria to grow and reproduce?   show
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show Exposing the food to extreme heat or radiation, freezing the food, and dehydration.  
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Created by: LiseBrinkley
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