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- Why do most iron-oxidizing bacteria grow at anacidic pH?1.). a.) What particular pathways or enzymes appear distinct for sulfate reducing bacteria in order to harness energy (create ATP)? b.) What interesting structures or unique characteristics allowed sulfate reducing bacteria to solve physical and/or chemical challenges/problems in conserving energy?a) bacteria are “obligate anaerobes.” What does this mean? On Earth, where might these organisms live? (Give examples.) b) Humans (and most Eukaryotic organisms) are obligate aerobes. What does this mean? On Earth, where might these organisms live? (Give examples.)
- Which is true regarding bacterial and archaea species that use nitrogen and sulfur compounds in different ways? A) O Sulfate-reducing bacteria are those that respire anaerobically using sulfate. B) O Nitrifying bacteria are lithotrophs that produce nitrite and nitrate. C) O Denitrifying bacteria are those that respire anaerobically using various oxidized forms of nitrogen. D) O Sulfur oxidizing bacteria are lithotrophs that obtain energy from sulfur compounds either aerobically or anaerobically E) O All the above are true.Name any two free – living nitrogen fixing bacteria.Clostridium tetani is a common soil bacterium and causes tetanus. Would you expect C. tetani to possess the enzyme catalase? Explain.
- E. coli, a facultative anaerobe, is grown for 24 hours on the same type of solid medium, but under two different conditions: one aerobic, the other anaerobic. The size of the colonies would bea) the same under both conditions.b) larger when grown under aerobic conditions.c) larger when grown under anaerobic conditions.Why are methanogens like the members of Methanobacteriales resistant to antibiotics like penicillin, ampicillin, and bacitracin?How do cyanobacteria survive freezing and desiccation?
- Name two enzymes that are present in obligate aerobes but lacking in obligate anaerobes. What is the function of each enzyme?Which of the following factors does NOT help cells survive and grow well in an AEROBIC environment? a) Superoxide Dismutase b) Catalase c) Peroxidase d) Hydroxyl radicals e) ThioglycolateWhat is meant when it is said that a bacteria is an obligate anaerobe?