MMI_Final_Part2_2008 - Medical Microbiology Final Exam/K...

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Medical Microbiology Final Exam /K. Land Name _____________________________ May 9, 2008 Part II. Multiple choice (2 points each). Indicate your choice on your scantron sheet. 1. In the fall of 2001, a series of letters containing spores of Bacillus anthracis were mailed to members of the media and to United States Senate office. The result was 22 cases of anthrax with five deaths. The heat resistance of bacterial spores, such as those of B. anthracis, is due in part to the presence of large amounts of a. Diaminopimelic acid b. D-glutamic acid c. Dipicolinic acid d. sulfhydryl-containing proteins e. lipid A 2. A 22-year old man presents with a painless 1-cm ulcer on the shaft of his penis. Inguinal lymphadenopathy is present. The patient admits trading drugs for sex and has several sex partners. He is confirmed to be positive for syphilis. However, a gram stain of a swab specimen from the ulcer shows no bacteria. Treponema palladium must be visualized using 3. Which of the following components is present in gram-negative bacteria but not in gram-positive bacteria? 4. Which of the following microorganisms is closely associated with dental caries? 5. A 67 year olf man had surgery for a ruptured sigmoid colon diverticulum with an abscess. A repair was done and the abscess was drained. He was treated 1
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with intravenous gentamicin and ampicillin. Ten days later and 4 days after being discharged from the hospital, the patient developed malaise, fever, and cramping abdominal pain. He had multiple episodes of diarrhea. His stool was positive or occult blood and presence of polymorphonuclear cells. On sigmoidoscopy the mucosa was erythematous and appeared to be inflamed, and there were many raised white to yellowish plaques 4-8 mm in diameter. Which of the following is the likely cause of the patient’s problem? a. Staphylococcus aureus enterotoxin b. Bacillus cereus toxin c. Clostridium dificile toxins d. Clostridium perfringens toxin e. Enterohemorrhagic Escherichia coli 6. A housewife who lives on a small farm is brought to the emergency room complaining of double vision and a difficulty in talking. Within the past 2 hours she noted a dry mouth and generalized weakness. Last night she served home- canned green beans as part of the meal. She tasted the beans before they were boiled. None of the other family members are ill. On examination, there is symmetrical descending paralysis of cranial nerves, upper extremities, and trunk. The correct diagnosis is which one of the following?
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