Fall2007_EX_02_Stems

Fall2007_EX_02_Stems - BIOLOGY 1421 SUMMER 2007 EXAM 02...

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BIOLOGY 1421 SUMMER 2007 EXAM 02 STEMS 1. Which of the following statements regarding prokaryotes is FALSE? Prokaryotes don’t have a nucleus Reproduce through prokaryotic fission Cell wall present Single Chromosome 2. Bacteria can be classified in a general way by their forms. These three groups are: Cocci- circular Bacilli- rod shaped Spirillum- helical 3.A rod-shaped bacterium is called a: Bacilli 4.A round-shaped bacterium is called a: Cocci 5. Gram- negative bacteria Disease causeing Doesn’t retain the purple staining turn pink after the counter-stain. 6. Both the glycocalyx and pilli may Help bacterial cells attach themselves to another organism protect the cell wall 7. Pili are used for Conjugation or attaching to other surfaces 8. Plasmids Are self replicating circles of DNA that contain instructions for creating sex pilis which are used in conjugation 9. Prokaryotic fission is the process used by bacteria to Reproduce and make two genetically identical daughter cells 10. Green bacteria engage in photosynthesis, do not use oxygen as an electron source, and are classified as chlorophytes 11. Most bacteria are prokaryotes , and include major decomposers and pathogens. 12. The nitrogen-fixing cells that can form among cyanobacteria are called heterocysts/Anabanena 13. Heterocysts are regions in filamentous cyanobacteria. False, share compounds with other cells in the chain cells and get carbohydrates in return. 14. Which bacterial feature would allow a bacterium to infect a host even after a long period of drying out? spores 15. When nutrients become scarce, some bacteria reduce their metabolism and colonize 16. Which of the following bacteria are the least related to the others?
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17.The type of bacterium most likely to be found in a swamp is Methanogens 18. The archaebacteria can be described by all of the following? 3 major groups Methanogens – found in swamps, stockyards, termite and mammalian guts Take up H2 and CO2 Release about 2 billion tons of methane (CH4) every year Extreme Halophiles – Brackish ponds, salt lakes, hydrothermal seafloor vents, commercial seawater Extreme Thermophiles – live in acidic, hot, sulfuric-righ water (nearly all are anaerobic). Able to withstand early Earth conditions 19-23. Answer questions using the five groups of bacteria listed: 19.These bacteria live in temperatures that are not usually conducive to life. 20 . These produce "swamp gas.". Methanogens 21.These bacteria can live in water of very high salt concentration. Extreme Halophiles 22.These can form heterocysts, valuable in nitrogen fixation. 23.These can serve as a source of antibiotics. Chapter 22: Protists – The Simplest Eukaryotes 24. The majority of protistans Have mitochondria, ER, and golgi bodies, have more than one chromosome. Have a cytoskeleton. Divide through mitosis and meiosis.
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This note was uploaded on 04/15/2008 for the course BIO 1420 taught by Professor Rast during the Spring '08 term at Texas State.

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Fall2007_EX_02_Stems - BIOLOGY 1421 SUMMER 2007 EXAM 02...

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