201 Exam1 Key - Name: _ Class: _ Date: _ ID: Blue Version...

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Name: ______________________ Class: _________________ Date: _________ ID: Blue Version 1 Micro 201 Exam 1 S2008 True/False Indicate whether the statement is true or false. ____ 1. All prokaryotic organisms are found within the domain Bacteria. ____ 2. Clear patches in cell cultures or lawns of host bacteria that indicate sites of virus infection are called plaques. ____ 3. The gram-staining procedure differentiates bacteria into two groups based on differences in the structure of their cell walls. ____ 4. Members of the Archaea are found only in extreme environments. ____ 5. The bacteria that are a major cause of bad breath can also cause tooth decay. ____ 6. Prions consist of proteins surrounded by a membranes derived from the host cell plasmalemma. ____ 7. A medium which allows only certain types of microbes to grow is called a selective medium. ____ 8. In both prokaryotes and eukaryotes, ribosomes play an important role in the synthesis of RNA molecules. ____ 9. Robert Koch was the first to prove that bacteria were capable of causing disease in animals. ____ 10. Most of the prokaryotic organisms found in nature have never been grown in culture. ____ 11. A micrometer is 1/1000 of a millimeter. ____ 12. Most of the prokaryotes in a deep ocean vent ecosystem (a “black smoker”) get their energy by oxidizing hydrogen sulfide found in the vent fluid. Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 13. The first step in the infection process for a virus infecting an animal cell is: a. formation of the viral envelope. b. specfic attachment of the virus to receptors on the cell surface. c. release of the virus DNA. d. production of an RNA polymerase. ____ 14. Among his many contributions, Louis Pasteur is noted for: a. being the first to view prokaryotic organisms in the microscope. b. isolating a virus for the first time. c. discovering the TCA cycle. d. disproving the theory of spontaneous generation. e. none of the above. ____ 15. In a culture medium the substance agar: a. serves as a rich source of nutrients b. acts as a selective agent, inhibiting the growth of fungi. c. acts as a solidifying agent.
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Name: ______________________ ID: Blue Version 2 ____ 16. Viral capsids are composed of: a. DNA. b. RNA. c. lipid. d. peptidoglycan. e. protein. ____ 17. When a protozoan ingests bacteria, the organelle that is most likely to be involved in intracellular digestion of the bacterial cells is the: a. lysosome. b. mitochondrion. c. micronucleus. d. smooth endoplasmic reticulum. ____ 18. The cell wall of gram-negative bacteria differs from that of gram-positive bacteria in that gram-negative bacteria: a.
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201 Exam1 Key - Name: _ Class: _ Date: _ ID: Blue Version...

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