U Immunity, T cytotoxic cells, AND MHCi types of serum antibodies against that a
ID: 272561 • Letter: U
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U Immunity, T cytotoxic cells, AND MHCi types of serum antibodies against that agent 2 years later? ho has been vaccinated against a disease should have primaily which of the A. IgA B. IgD C. IgE D. IgG E. IgM Host-Microbe Interactions Ch. 16 31. The C5a peptidase enzyme of Streptococcus pyogener breaks down CSa, realting i A. lysis of Streptococcus cells. B. lack of opsonization of Streptococcus cells. C. killing of phagocytes. D. decreased accumulation of phagocytes. E. inhibition of membrane attack complexes. 32. The first step in the establishment of infection is that the organism must O A. invade host tissues. B. attach to host cells. C. evade phagocytes.D D. produce toxins. E. form a biofilm. 33. The "hygiene hypothesis" proposes that D A. the immune system develops best in a clean environment. B. Hypothetical "hygienic bacteria" are the causative agents of certain diseases C. Exogenous antigens activate plas?ma cells. D. lack of exposure to microbes can promote development of allergies E. hand washing is the best preventative measure against infection. 34. Attributes of an organism that promote pathogenicity are called A. disease factors. B. colonization factors. C. mutualistic factors D. virulence E. hypervariable factors. factors. 35. Which of the following does Streptococcus pnemoniae use to survive in the host? A. Plasmids C. Flagella D. Capsules E. Biofilm formation 36. The spread of toxin via circulation is called A. septicemia. O B. bacteremia. O C. sepsis loxemia.Explanation / Answer
30. Approximately 80 percent of IgG antibodies are present in serum of a person vaccinated against a disease. Hence the answer for this question is IgG.
31. The C5a is capable of attracting phagocytes to the site of infection caused by the bacteria. As a result of the cleavage of C5a by the C5a peptidase enzyme, the chemotaxis of neutrophils will be inhibited. Hence the answer for this question is decreased accumulation of phagocytes.
32. The organism should bind to the host cells to establish an infection. Hence the answer for this question is attach to host cells.
33. According to the hygiene hypothesis, the lack of exposure to the infectious agents during the childhood could increase the susceptibility of person to allergies due to the suppression of natural development in immune system. Hence the answer for this question is lack of exposure to microbes can promote development of allergies.
34. The virulence factors produced by the microbes, are capable of promoting the ability of an organism to cause disease. Hence the answer for this question is virulence factors.
35. The polysaccharide capsule of Streptococcus pneumonia is capable of providing protection for the organism against opsonophagocytosis. Hence the answer for this question is capsule.
36. The spread of toxin through the circulation during the microbial infection is called toxemia. Hence the answer for this question is toxemia.
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