STUDY GUIDE FOR CHAPTERS 6

STUDY GUIDE FOR CHAPTERS 6 - STUDY GUIDE FOR CHAPTERS...

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STUDY GUIDE FOR CHAPTERS 6,7,20 (Tortora, Funke and Case) CHAPTER 6 - Microbial Growth Physical requirements for the growth of microorganisms Temperature (optimum growth temperature) psychrophiles - where might you fine these? mesophiles - human pathogens? thermophiles - among other places think about the hydrothermal vents (350 C; 662 F). Riftia? pH what kinds of organisms would grow at neutral pH? What are acidophiles? Thiobacillus ferrooxidans makes sulfuric acid and survives at pH 1 Low pH often used to preserve food - examples? What are buffers and why include buffers in growth media for lab? osmotic pressure tolerant of high salt - halophiles - Staphylococcus what is plasmolysis? High sugar effects? Chemical requirements for growth Carbon autotrophic vs. heterotrophic Nitrogen where is it found in the cell? how do cells get the nitrogen they need? - nitrogen in organic molecules vs nitrogen fixation What does Rhizobium do with legumes? Where does ammonia come from? Sulfur What is sulfur used for in the cell? Riftia again? Sulfur compounds as an energy source? Phosphorus
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Name several molecules in which phosphorus plays an important role - like maybe in nucleic acids and energy molecules - which ones? Trace elements - often needed as cofactors - what does this mean? iron copper zinc molybdenum calcium magnesium manganese Oxygen very reactive and toxic gas, yet aerobes have ñlearnedîto use it and indeed require it for life. organisms can be classified based on their need and tolerance of oxygen. obligate aerobes absolute requirement for oxygen in metabolism. These organisms have enzymes which neutralize the toxic forms of oxygen. facultative anaerobes metabolic need is not absolute-that is, they can ferment if there is no oxygen around. Possess enzymes to neutralize toxic forms of oxygen, therefore they can live in the presence of oxygen. microaerophiles
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This note was uploaded on 11/05/2010 for the course BIOL 211 taught by Professor Paxton during the Fall '10 term at Salem College.

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STUDY GUIDE FOR CHAPTERS 6 - STUDY GUIDE FOR CHAPTERS...

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