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Bacteria Phyla Proteobacteria - Largest and most diverse phylum - Contain genus Rhizobium – convert nitrogen into ammonia - Contain genus Nitrosomnas –convert ammonia to nitrite which allows other bacteria to convert to nitrate - Contains genus Agrobacterium causes tumors in plants - Rickettsiae causes Rocky Mtn. Fever - Helicobacter pylori causes stomach ulcers - Species are enteric such as E. coli make vitamin K and help enzymes break down food - Contains genus Salmonella which invades intestinal cells or creates toxins Gram-Positive Bacteria - Most gram+ but some are gram – - Contains streptoccal species causes strepthroat - Contains Clostridium botulinum - Contains Lactobacilli – creates lactic acid turns milk soar and used to make yogurt - Contains Bacillus anthrax – biological weapon - Contains Actinomycetes used to make antibiotics such as tetracycline & Streptomycin - Contains genus Mycobacteria causes tuberculosis and leprosy Cyanobacteria - Contain genus Anabaena which form specialized cells called heterocysts that convert nitrogen into ammonia - Responsible for Oxygen rich atmosphere Spirochetes - Gram negative bacteria - Some aerobic or anaerobic - Contains Treponema pallidum causes Syphilis - Contains Borrelia burgdorferi causes Lyme disease Chlamydia - Gram Negative Coccoidal Live only inside animal cells Cell walls lack peptidoglycan Chlamydia trachomatis causes nongonococcal urethritis or chlamydia