Microbiology MCQs (100% accurate answers)

Activated macrophages are required in elimination of infections caused by a) intracelular bacteria b) extracelular microbes c) both above mentioned d) nothing of above mentioned correct answers b Antibodies of which of mentioned classes cross placental barriere a) IgG b) IgM c) IgA d) IgD correct answers a The number of polypeptid chains is the highest in the molecule of a) IgG b) IgM c) IgE d) IgD correct answers b Complement fixation reaction (CFR) a) is the reaction during which the complement cascade is activated b) is reaction to measure the concentration of the complement in the serum of the patient c) is serological reaction to detect antibodies d) is reaction in vitro to determine the level of activated complement correct answers c Virulence of the microbe with the LD 50 = 1 x 103 a) is lower than that of the microbe with the LD 50 = 1 x 10 5 b) is higher than that of the microbe with the LD 50 = 1 x 10 5 c) is not determined by this formule d) means that indicated number of microbes kills 50 of 1000 exposed correct answers b Time period between exposition and clinical signs is in hypersensitivity of the type I a) shorter than in hypersensitivite of the type IV b) longer than in the hypersensitivity of the type IV c) equal as in hypersensitivity of the type IV d) cannot be compare with the time period in hypersensitivity of the type IV correct answers a Antibodies are required for the presentation of clinical signs in the hypersensitivity of the type (types): a) I and IV b) all four types c) I, II and III d) only type type I correct answers c