Exam 3 with Answers - Microbiology for Health Science | BIOL 2250, Exams of Biology

Download Exam 3 with Answers - Microbiology for Health Science | BIOL 2250 and more Exams Biology in PDF only on Docsity! BIOL 2250 – Microbiology for Health Sciences – Exam 3 Fall 2008 Instructor: Renee McFarlane NAME _________________________________________ Mark your answers on BOTH the scantron sheet and on the test. Write your name on the first page of the test and on the scantron answer sheet. If there is not an answer marked on the test, then you will not receive credit for mistakes due to erasure. The test is worth 100 points. The multiple-choice will be worth 80 points and the true/false questions are worth a total of 20 points. Please report any typos or numbering errors. Finally, if a question is not clear, ASK for clarification. If you are confused about how to mark the answers on your scantron sheet ASK! Credit will not be given for unasked questions. 1.The most frequently used portal of entry for pathogens is the a. mucous membranes of the respiratory tract. b. mucous membranes of the gastrointestinal tract. c. skin. d. parenteral route. e. All are used equally. 2.Which of the following is not a characteristic of inflammation? a. Red color from blood accumulation b. Pain from injury to local nerves c. Abnormally high body temperature d. Swelling from accumulation of fluid 3.Which of the following is not a membrane- disrupting toxin? a. A-B toxin b. Hemolysin c. Leukocidins d. Streptolysin O e. Streptolysin S 4. Large complex molecules that provoke an immune response are referred to as: a. phagocytes b. antigens c. transfer factors d. lymphokines 5. The ID50 is a a. measure of pathogenicity. b. dose that will cause an infection in 50% of the test population. c. dose that will kill some of the test population. d. dose that will cause an infection in some of the test population. e. dose that will kill 50% of the test population. 6. Which type of antibody protects the respiratory and infant gastrointestinal tracts? a. IgA b. IgE c. IgG d. IgM 7. All of the following may be used for adherence except a. fimbriae. b. cell membrane mannose. c. glycoproteins. d. lipoproteins. e. capsules. 8. The main cells participating in antibody-mediated immunity are: a. phagocytes b. cytotoxic T cells c. macrophages d. B cells 1 BIOL 2250 – Microbiology for Health Sciences – Exam 3 Fall 2008 Instructor: Renee McFarlane 9. The mechanism by which gram-negative bacteria can cross the blood-brain barrier. a. Producing fimbriae b. Inducing endocytosis c. Producing toxins d. Inducing TNF 10. Microbial toxins are neutralized by antibodies known as: a. agglutinins b. precipitins c. gamma globulins d. antitoxins e. None of the above. 11. “Margination” refers to a. the adherence of phagocytes to microorganisms. b. the chemotactic response of phagocytes. c. adherence of phagocytes to the lining of blood vessels. d. dilation of blood vessels. e. the movement of phagocytes through walls of blood vessels. 12. Which genus of bacterium contributes to plaque, cavities, gingivitis and periodontal disease? a. Streptococcus b. Staphylococcus c. Bacillus d. Escherichia e. Proteus 13. Which endogenous molecules are specifically involved in fever induction? a. Cytokines b. Lymphokines c. Pyrogens d. Macrophages e. Interferons 14. The stomach usually contains a very low concentration of bacteria due to a. the neutral pH b. the high pH c. the low pH d. the high turnover rate of contents e. the inhibitory actions of bile 15. Which of the following is not a mechanical factor to protect the skin and mucous membranes from infection? a. Layers of cells b. Tears c. Saliva d. Lysozyme e. Epiglottis 16. The complement system aids the host defense by a. mediating inflammation b. attracting phagocytic cells c. cytolysis d. coating antigen e. All of the above 17. Which of the following statements is true? a. Interferon is an antiviral protein. b. Interferon promotes phagocytosis. c. Interferon causes cell lysis. d. Interferon acts against specific viruses. e. Interferon attacks invading viruses. 18. The complement system acts in a ________ fashion, amplifying the response. a. synergistic b. cascade c. alternative d. classical e. mutualistic 19. Nonspecific resistance is a. the body’s ability to ward off diseases. b. the body’s defenses against any kind of pathogen. c. the body’s defense against a particular pathogen. d. the lack of resistance. e. None of the above. 20. Which DOES NOT provide long term immunity? a. Naturally acquired active immunity b. Artificially acquired active immunity c. Artificially acquired passive immunity d. All of the above 2