Author: qnasb27

Which one of the following statements about the nature of diphtheria toxin is FALSE? a. Inhibits protein synthesis in target cells b. Is a slow acting, heat labile, diffusible protein exotoxin c. Production...

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

Which organism produces a potent exotoxin? a. Shigella boydi b. Shigella dysenteriae c. Shigella flexneri d. Shigella sonnei e. None of these.

Which description of tetanus toxin is FALSE? A. Blocks synaptic inhibitory transmitter B. Converted to toxoid by formalin C. Formed only by virulent strains of Clostridium tetani D. Reaches CNS via motor...

The following are used for the preservation of virus, except a. Freezing (–20°C–70°C) b. Lyophilization c. Ether d. Formaldehyde

Which term BEST describes the clinical syndrome which is associated with a rapid, continuous invasion of the blood stream by bacteria? A. Bacterial endocarditis B. Invasive infection C. Septicaemia D....

What term is used for any infection which is accompanied by the signs and symptoms of disease? a. Clinical infection b. Febrile illness c. Invasive infection d. Latent infection e. Nosocomial infection.

Which one of these commensal organisms is MOST likely to become active as an opportunistic pathogen during prolonged treatment with a broad-spectrum antibiotic? a. Actinomyces israeli b. Candida albicans...

Which microbial property does NOT interfere with the body's attempt to localize infection? A. Fibrinolysin or Streptococcus pyogenes B. Motility of Salmonella paratyphi B C. Polysaccharide capsule of Streptococcus...

Which one of the properties listed here as a characteristic of bacterial exotoxins is FALSE? a. Diffusible, highly toxic, immunogenic protein b. Marked specificity of action c. May mimic disease when injected...

Test used for AIDS is a. Widal test b. ELISA c. Aggluatination d. CFT

Reagenic type antibody is a. IgG b. IgA c. IgM d. IgE

The reaction of soluble antigen with antibody is known by a. Precipitation b. Flocculation c. Agglutination d. Complement fixation

Interferon is composed of a. Lipids b. Lipoprotein c. Glycoprotein d. Nucleic acid

Agglutination reaction is strongest with the immunoglobulin: a. IgM b. IgG c. IgA d. IgD

Hybridoma technique is used for a. Monoclonal antibodies b. Polyclonal antibodies c. Both a and b d. None of these

Delayed type of hypersensitivity is seen in a. Penicillin allergy b. Contact dermatitis c. Arthus reaction d. Anaphylaxis

Pasteur developed the vaccines for a. Anthrax b. Rabies c. Chicken cholera d. All of the above

Active immunity is induced by a. Infection b. Placental transfer of antibodies c. Injection of antibodies d. Injection of gamma- globulins

Intensity of attraction between antigen and antibody molecule is known as a. Affiniy b. Avidity c. Reaction d. None of these