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Online Mock Test 149 (PGI Pattern)

Author: RxPG, Posted on Sunday, August 22 @ 17:21:55 IST by RxPG  

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Microbiology

Multiple Choice Test



1) Streptococcus pyogenes:

Choose 2 of the following options.
   a) is alpha-haemolytic when grown on blood agar;
   b) is the commonest cause of acute pharyngitis;
   c) can be cultured from heart valves in acute rheumatic fever;
   d) is a frequent cause of cellulitis;
   e) is always susceptible to penicillin.





2) Immunoglobulin M:

Choose 2 of the following options.
   a) is a glycoprotein;
   b) comprises 75% of the total serum immunoglobulins;
   c) has a pentameric structure;
   d) plays a major role in the defence against parasites;
   e) is the only immunoglobulin to actively cross the placenta.



3) In viral meningitis:

Choose 4 of the following options.
   a) the overall mortality is less than pyogenic meningitis;
   b) the CSF cellular response is predominantly lymphocytic;
   c) CSF glucose concentrations may be markedly decreased;
   d) examination of throat swabs and faecal samples may aid diagnosis;
   e) there is a seasonal peak in incidence during the summer months.



4) Cell-mediated immunity is important in the immune response to:

Choose 3 of the following options.
   a) Mycobacterium tuberculosis;
   b) herpes viruses;
   c) tetanus;
   d) diphtheria;
   e) Chlamydia trachomatis.



5) In bacterial endocarditis:

Choose 4 of the following options.
   a) infection involving the mitral valve is commoner than that involving the tricuspid valve;
   b) enterococcal infection may follow gastrointestinal manipulation such as surgery or endoscopy;
   c) second infection with the same species of bacterium does not occur;
   d) coagulase negative staphylococci are commonly associated with infections on prosthetic valves;
   e) infection with Staphylococcus aureus is associated with intravenous drug abuse.



6) The following viral infections can be prevented by vaccination:

Choose 3 of the following options.
   a) hepatitis A;
   b) hepatitis B;
   c) hepatitis C;
   d) mumps;
   e) Epstein-Barr virus.



7) In pyogenic brain abscess:

One answer only.
   a) infection frequently follows on from acute pyogenic meningitis;
   b) Staphylococcus aureus abscesses often occur following haematogenous (blood borne) infection;
   c) surgery is not usually indicated;
   d) anaerobes are infrequently isolated;
   e) Streptococcus pneumoniae is a common cause.



8) penicillin:

Choose 3 of the following options.
   a) is a beta-lactam compound;
   b) is bactericidal against susceptible bacteria;
   c) cannot be given intravenously;
   d) is not active against Gram negative bacteria;
   e) is a useful agent for the therapy of syphilis.



9) Sterilisation may be achieved by the following chemical agents:

Choose 2 of the following options.
   a) glutaraldehyde;
   b) ethylene oxide;
   c) chlorhexidine gluconate;
   d) dipicolinic acid;
   e) quaternary ammonium compounds.



10) Streptococcus pneumoniae:

Choose 3 of the following options.
   a) is the commonest cause of community acquired pneumonia in adults;
   b) is "bile soluble";
   c) is not found as part of the normal upper respiratory tract flora in humans;
   d) is usually susceptible to metronidazole;
   e) is frequently isolated from clinical specimens in cases of acute sinusitis and acute otitis media.





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