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- Of what value is the plant pathogen Agrobacterium?
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- Which is false among A-E regarding symbiotic nitrogen fixation? A) O Initiation of the symbiosis involves communication between the plant and bacteria B)O Within the plant, the bacteria differentiate into N2 fixing bacteroids C) O The N2-fixation process is sensitive to oxygen. D) O The bacteria infect the root of the plant via an infection thread. E) O None are false; A-E are all true,What are the factors affecting the pathogenicity of a parasitic amoeba? Explain.One such pathogen, Rhizobium radiobacter (formerly known as Agrobacterium tumifaciens), is useful to humans, despite the fact that it can cause widespread damage to crops such as apples and grapes. The reason?
- i)What are phytoalexins? ii)Explain how it is synthesized? iii)Briefly, explain a few distinctly different approaches to mass producing phytoalexins for medicinal use.Agrobacterium tumefaciens carries a _______ that enters dicotyledonous (dicot) plant cells, transforming the cells into tumor cells and causing crown gall disease.Mycorrhizal fungi form obligate symbiotic relationships within plants. They are able to fix N2 into a usable form of nitrogen. In exchange, they receive nutrition from the plant. Which of the following is a true statement concerning mycorrhizal fungi? a) Finding a host plant is not crucial to their survival. b) They are a dominant species. c) They cannot survive without the host plant. d) They are considered plant parasites.
- What are mycorrhizae? a) The bodies of fungi, composed of hyphae b) fungi that attack plant roots, causing disease C) fungal hyphae that are massed together into stringlike structures d) fungi that have symbiotic partnerships with algae or cyanobacteria e) mutually beneficial associations of particular fungi and plant rootsWhy is the mold Penicillium economically important?Is staphylococcus a parasite or saprophyte?