Microbiology MCQs Test Questions and Correct Solutions, Rated A+

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 - b Antibodies of which of mentioned classes cross placental barriere a) IgG b) IgM c) IgA d) IgD - a The number of polypeptid chains is the highest in the molecule of a) IgG b) IgM c) IgE d) IgD - 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 - 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 - 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 - 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 - c Endotoxin : a) Is very immunogenic b) Stimulates the production of precipiting antibodies c) Is a part of Gram negative cell wall d) Is the cause of sepses - c Antitoxin a) Is antibody against toxin b) Is toxin deprived of the toxicity c) Is immunogenicity deprived toxin d) Means the same as toxoid - a Immunoglobulins with monomeric structure (1 polypeptid chain) are: a) IgG, IgE, IgD b) IgG, IgA, IgD, IgE c) IgM, IgA, d) IgG, IgE - a Capsule in encapsulated strains of Haemophilus influenzae, Streptococcus pneumoniae and Neisseria meningitidis is the tool of a) pathogenity b) virulence c) immunity d) infecion - b Exotoxin of Clostridium botulinum is the tool of: a) pathogenity b) virulence c) immunity d) infection - a . Humoral immunity has the crucial role in protection against a) diphtheria b) tuberculosis c) AIDS d) Skin mycoses - d Humoral immunity has the crucial role in protection against a) diphtheria b) tuberculosis c) AIDS d) Skin mycoses - d Against facultative pathogens we are protected mainly by a) Tools of nonspecific immunity b) Tools of specific humoral immunity c) Tools of specific cell immunity d) T helper lymfocytes - a Penicilin antibiotics are the less toxic because a) They are products of fungi b) They have a very simple chemical structure c) Cannot cross the intestinal mucouse membrane d) Are active on structure that are situated at the level of bacterial cell wal - d Invasive disease is a) bacterial meningitis caused by encapsulated strain b) skin abscess dysenteria c) diphtheria - a Which of the mentioned posibilities indicates the titre of antibodies a) 1:160 b) 160 c) 116o d) 1x160 - a Which way of writing the name of bacteria is scientifically and formaly correct (e.g. in your book of microbiology) a) Staphylococcus aureus (in italics) b) Staphylococcus Aureus c) Staphylococcus aureus d) Staphylococcus Aureus - a