33. Whichofthefollowingspeciesisamodelorganism? A. Treponema pallidum (causal agent of syphilis) B. Mycobacterium tuberculosis C. Caenorhabditis elegans (a nematode worm) D. Histoplasma capsulatum (an ascomycetes fungus that causes histoplasmosis) E. Viscum album (mistletoe, a plant parasite widely known as mistletoe)
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Possible Suspects One of the difficult things about a mysterious illness, especially when it appears to affect different organismal taxa, is how to identify the source of the infection. Based on what you know about organismal biology, what cellular and biochemical features or processes would you need to know to determine if the mystery illness is caused by: a. Bacteria? b. Protist? c. Fungus? d. Plant? e. Animal? Based on what you know about organisms and the additional information provided by your textbook, what type of classification would you give to our mystery organism? In the summer of 2001, public officials from the British Columbia Center for Disease Control received phone calls about odd deaths that were happening around Vancouver Island. The health department and local vets came to investigate. Dead porpoises were found at the shorelines with bloated organs several times their normal weight that suffocated the animals to death. The vets had never seen anything like this. Around the same time, calls came in for cats and dogs who were suffering from weird symptoms. Some had weeping holes, produced when infections ate through their skulls. Others simply had trouble breathing. Within a couple of weeks, a few people on the island began to fall ill with an unknown malady. They coughed constantly, their energy sapped, their sleep stolen. Chest x-rays revealed ominous lung or brain nodules. Biopsied tissue revealed that the culprit was not cancer.
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30. Chronic granulomatous lesions containing sulfur granules is diagnostic of this pathogen a. Peptostreptococcus b. Acinetobacter c. P. acnes d. Actinomyces 31. Bacterial vaginosis is characterized by an increase in a. Staph aureus b. Lactobacillus c. Mobiluncus d. Chlamydia 32. The Brucella species most often causing disease in the U.S. a. suis b. melitensis c. canis d. abortus e. tularensis 33. The main reservoir of Bordetella pertussis is domestic pets. TRUE FALSE 34. Exotoxin A production by Pseudomonas aeruginosa disrupts the production of a. cell membrane b. cell wall c. nucleic acids d. proteins 35. A nosocomial non-fermenting gram negative bacillus that is oxidase negative is a. Pseudomonas b. Aeromonas c. Stenotrophomonas d. Neisseria 36. Intra-abdominal abscesses are usually the result of a. Clostridium botulinum b. a single aerobic pathogen c. mixed aerobic and anaerobic pathogens d. Salmonella or Shigella 37. Rocky Mountain Spotted Fever is transmitted a. where contaminated food is served b. through close personal contact c. by human body lice d. by dog or wood ticks An accumulation of replicating organisms called morulae, found in the cytoplasm of white blood cells, is diagnostic for a. malaria b. chlamydia c. rocky mountain spotted fever d. ehrlichiosis Which of the following is not a trait of Chlamydia? a. contain both DNA and RNA b. transmitted by arthropod vectors c. produce an inert form d. obligate intracellular parasites When isolating a pathogen from a disease site, recovery or detection of that pathogen may not be possible due to a. not meeting the metabolic needs of the pathogen b. insufficient c. failing to maintain proper transport conditions d. all of the above Impetigo is an infection caused by a. Staph aureus not Strep pyogenes b. Strep pyogenes not Staph aureus c. Staph aureus or Strep pyogenes d. neither Staph aureus nor Strep of scarlet fever is caused by an erythrogenic toxin, which is coded by a phage. TRUE FALSE granuloma venereum is a sexually transmitted disease caused by a. Treponema pallidum b. N. gonorrhoeae c. Chlamydia trachomatis
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