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second_midterm_answer_key

second_midterm_answer_key - SAS5 2ndMIDTERMexam...

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 SAS5 Name: ……………………………………………… 2 nd MIDTERM exam Wednesday February 23, 2010 1. Chestnut blight is a disease caused by a fungus named  Cryphonectria parasitica . The fungus can be  infected by a virus called  Cryphonectria  hypovirus. What are the effects of the virus on the fungus? (5 points) weakened sporulation slowed growth reduced virulence 2.  Bdellovibrio  is a parasite of bacteria. Give two reasons why it could be useful as a “living antibiotic”? (5  points) doesn’t attack mammalian cells weakly immunogenic kills pathogens can survive in the gut 3. What are two common symptoms of tuberculosis (also known as TB)? (3 points) coughing up blood fever night sweats weight loss
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4. How is TB transmitted? (3 points) airborne coughing or sneezing 5. Briefly describe the route of infection for  Mycobacterium tuberculosis  (the cause of TB). Use the following  words in your answer: pulmonary alveoli, alveolar macrophages and granuloma/tubercle (5 points) M. tuberculosis  is inhaled and reaches the pulmonary alveoli, is taken up by the alveolar macrophages and a  granuloma/tubercle forms as a result of an immune response. 6. What is the difference between HIV and AIDS? In your answer, explain what the two acronyms stand for. (5  points)
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