Author: qnasb27

Which one of the following is a property of endotoxin from coliform bacilli? a. Completely neutralized by antisera b. Firmly cell-bound and non-diffusible c. Largely composed of protein d. Purified endotoxin...

Which property of Mycobacterium tuberculosis is thought to determine its destructive effect in the body? A. Ability to induce delayed hypersensitivity B. Ability to produce "cord factor" C. Classical endotoxic...

In which of the following is bacteraemia LEAST likely to occur? a. Anthrax b. Brucellosis c. Diphtheria d. Miliary tuberculosis e. Subacute bacterial endocarditis.

Metastatic pyaemic abscesses occur MOST frequently as a complication of infection with which organism? a. Bruceila abortus b. Cory ne bacterium diphtheriae c. Salmonella typhimurium d. Staphylococcus aureus...

"Cord formation" is characteristically shown by cultures of virulent strains of which organism? a. Bordetella pertussis b. Clostridium tetani c. Corynebacterium diphtheriae d. Haemophilus influenzae e....

Which class of immunoglobulin is MOST effective in specific bacterial agglutination? A. IgA B. IgD C IgE D. IgG E. IgM.

Which organism exerts its pathogenic effect by secretion of a potent exotoxin which continuously stimulates the adenyl cyclase activity of mucosal cells? a. Clostridium welchii b. Salmonella typhimurium...

Which is the MOST prominent immunoglobin class present in external secretions? a. IgA b. IgD c. IgE d. IgG e. IgM.

Which organism produces a toxin which blocks neuro- muscular transmission in cholinergic motor nerves? a. Clostridium botulinum b. Clostridium tetani c. Corynebacterium diphtheriae d. Shigella dysenteriae...

Which property attributed to IgM is FALSE? a. Combines with specific antibody b. Fixes complement c. Functions as protective antibody d. Most abundant antibody class in uninfected newborn e. Specific attachment...

Which one of the following shows if a clinical isolate of Corynebacterium diphtheriae is toxigenic? a. Bacterial agglutination with specific antisera b. Colonial morphology on blood tellurite medium c....

Which one of the following is an example of innate or natural immunity? A. Natural recovery by crisis in pneumococcal pneumonia B. Neonatal immunity to haemophilus meningitis C. Prophylactic immunization...

Which property is NOT included in the non-specific immune response? a. Chemotactic factors b. Interferon c. Lysozyme d. Memory cells e. Phagocytosis.

Which is NOT a property of interferon? a. Acts extracellularly to inactivate virus b. Coded for by cellular DNA c. Not virus-specific but is cell specific d. Released from infected cells e. Synthesis triggered...

Which one of the following does NOT contribute to nonspecific immunity? a. Ciliated respiratory epithelium b. Commensal bacterial flora c. IgE d. Neutrophil chemotaxis e. Skin fatty acids.

Which cell is an essential constituent of pus? a. Basophil b. Eosinophil c. Erythrocyte d. Lymphocyte e. Neutrophil.

Which one of the following does NOT relate to the nonspecific defence enzyme, lysozyme? A. Absent from normal urine, CSF and sweat B. Classified as a muramidase C. Found in tears, saliva and nasal secretions...

Regarding complement A. C5a is an important opsonising molecule. B. C3b has chemotactic function. C. it cannot cause cytolysis of bacteria in the absence of immune complexes. D. C3a may cause mast cell...

With regard to eicosanoids A. main action of LTB4 is to increase permeability. B. PGE2 causes intense vasoconstriction. C. permeability increase caused by LTD4 restricted to venules. D. LTC4, LTD4, LTE4,...

In the complement system, which is not true? A. C3a, C5a cause vasodilation, and increased vascular permeability. B. C5a is a powerful chemotactic agent. C. C5a activates the cyclo-oxygenase pathway of...