Student Multiple Choice Questions MICR 201 2010 69. Which type of hypersensitivi
ID: 280924 • Letter: S
Question
Student Multiple Choice Questions MICR 201 2010 69. Which type of hypersensitivity reaction causes inflammation via complement activation? A) Typel B) Type lI C)Type III D) Type ? E) All of these. Anaphylactic shock from an insect venom d-causes an lgE mediat for the clinical signs to appear? A)5-12 h B13-8h C)1-2days 70. ted reaction. How much time would it take D) 30 min E) 1 week. 71. What type of hypersensitivity reaction is against a lipid allergen that is adsorbed through skin and crosses cell membranes and shows signs within~ 24-48 h A) Typel B) Type lI C) Type IlI D Type IV E) All of these. 72. What is an example for a type IlI hypersensitivity reaction? A) C) transfusion reaction D) serum Reaction to insect venom sickness E) All of these. B) tuberculin test 73. What type of hypersensitivity reaction is the fastest? A) Type IV B) Type III C)TypeII D) TypeE) All have the same response time. 74. Which of the following does not result from release of histamine containing granules? vasoperme' E)All of these are coret. A) increased B) increased mucus production C) joint pain and swelling D) constriction of airways 75. What is one of the characteristics of a type Ill hypersensitivity reaction? E) All of these. B) Hives C) joint swelling and plain D) Blisters on the skin A) Itching 76. Which hypersensitivity reaction type occurs within days after allergen exposure? c)Type III D) Type ? E) All of these A) Type I B) Type lIExplanation / Answer
1) The enzyme streptokinase secretes plasmin which in turn degrades fibrin matrix of the thrombus. Thus, the enzyme streptokinase has thrombolytic property. Coagulase converts fibrinogen to fibrin. Hyaluronidase catalyses the degradation of hyaluronic acid. Collagenase break down the peptide bonds present in collagen. Therefore, all these enzymes facilitate degradation of tissues. So, the correct answer for this question is option E (all are correct).
2) In parenteral route of entry, the pathogens are directly introduced into the bloodstream. Some of the examples of parenteral route include hypodermic needles, cuts, bites, stab wounds, intravenous infusion etc. So, among the given options, the entry by mucous membrane is not a parenteral route (option C).
3) Exotoxins are usually heat labile proteins. Endotoxins are usually heat stable lipopolysaccharides. So, the answer for this question is option C (proteins).
4) AB toxins are type III toxins secreted by some of the pathogenic bacteria. A in AB toxin stands for the "active" portion and B stands for "binding" part. So, the correct answer for this question is option A (active).
Please post other questions separately.