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- What are the conditions necessary for fixation of atmospheric nitrogen byRhizobium. What is their role in N2-fixation?How does the Amoeba respond to nutrient broth?What are the unique problems associated with Nitrogen fixing organisms in terms of energy production and the need for low O2 tension to protect nitrogenase? Can you please describe in detail how Azotobacter and Rhizobium species solve these problems. Thank You
- Describe how a vegetative cell, a heterocyst, and an akinete are different. How are heterocysts modified to carry out nitrogen fixation?What are three processes that cause nitrogen fixation?Soil often goes through periods of extreme dryness and extreme wetness. What characteristics of clostridium species make them well suited for these conditions?
- Compare and contrast the production of a planttumor by Agrobacterium tumefaciens and a root noduleby a Rhizobium species. In what ways are thesestructures similar? In what ways are they different?Of what importance are plasmids to the developmentof both structures?What is the Function of Leghaemoglobin in nitrogen fixation.what is the significance of psychrotrophs in spoilage of refrigerated foods
- What are the factors affecting the pathogenicity of a parasitic amoeba? Explain.Why might the ability to form dormant cysts be of great advantage to an agrobacterium but not as much to a rhizobium?From the standpoint of energy metabolism, how do chemoorganotrophs differ from chemolitotrophs? What carbon sources do members of each group use? Are they heterotrophs or autotrophs?