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clinical microbiology

microbiology mcqs questions

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Heat stable enterotoxin causing food poisoning is caused by a...

Subject :-


Correct answer :- *** Hidden ***

Explanation :-

terotoxins. Food poisoning is caused by an enterotoxin which is heat labile. The 4 major toxins produced by it are alpha, beta, epsilon and iota. Alpha toxin which is a ph

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2013-11-16 10:18:33
Heat stable enterotoxin causing food poisoning caused all following EXCEPT: Bacillus cereusStaphylococcusYersinia enterocoliticaClostridium perfringens Clostridium perfringens produces distinct toxins including several enterotoxins Food poisoningcaused enterotoxinheat labile The major toxins produced alpha beta epsilon and iota Alpha toxin isphospholipaseis associated with gas gangrene Ithemolytic hot-cold variety toxin produced all Clperfringens but most abundantly Type shows Nagler reactionzoneopacityformed thereno antitoxin Lecithinasealso produced Clnovyi Clbifermentans some vibrios initiates muscle infection that may progress gas gangrene Beta and iota toxin also have lethal and necrotizing properties Theta toxin hemolysisantigenically related streptolysin also known Perfringolysin also produces neuraminidase histamine bursting factor etc Ref: TextbookMicrobiology Ananthanarayan and Panicker 8th Edition Page 395
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Topic :- clinical microbiology

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Subject :-microbiology

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Bacteria can transfer genetic information through all following methods except: Through conjugationThrough bacteriophagesThrough incorporation part host DNA taking soluble DNA fragments across their cell wall from other species Genetic information can transferred from one bacterium another through three methods transformation transduction and conjugation Methods transfer Mechanism Nature DNA transferred Transformation Transfer DNA from one bacterium another Any gene Transduction Transfer DNA from one bacterium another bacteriophage Any gene generalized transduction only selected genes specialized transduction Conjugation Transfer DNA from one bacterium another through sex pilus Chromosomal plasmid DNA Ref: Textbook Microbiology Ananthanarayan and Panicker 6th Edition Page Textbook Microbiology and Immunology Parija Pages 54-7 .......

Which the following statements about Prions true? They are infectious

Subject :-microbiology

Topic :- clinical microbiology

following statements about Prions true They infectious proteins They made bacteria and virusThey have rich nuclear materialThey can cultured cell free media Prions infectious proteins devoid any nucleic acid (DNA and RNA) Ref: Medical Microbiology Jawetz 24th Edition Page 581; Harrison’s Principles Internal Medicine 16th Edition Page 2495; Textbook Microbiology Ananthanarayan 7th Edition Page 567 .......

Virus mediated transfer host DNA from one cell another known as: Conj

Subject :-microbiology

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Virus mediated transfer host DNA from one cell another known as: ConjugationTransduction TransformationIntegration Transduction process DNA transferred from one bacterium another virus also refers the process whereby foreign DNA introduced into another cell via viral vector Transduction does not require cell-to-cell contact occurs conjugation) and DNAase resistant common tool used molecular biologists stably introduce foreign gene into host cell's genome Depending type life cycle different phage species two types transduction can occur They generalized and specialized transduction Ref: Review Medical Microbiology and Immunology 11th Edition Chapter 4;Biology Prokaryotes Lengeler Page 406; Lateral DNA Transfer: Mechanisms and Consequences Frederic Bushman Page .......

Which the following the most common pathogens responsible for nosocomial

Subject :-microbiology

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With reference Escherichia coli infections, the following are true, EXCEP

Subject :-microbiology

Topic :- clinical microbiology

With reference Escherichia coli infections following true EXCEPT: Enteroaggregative coli associated with Persistant diarrhoeaEnterohemorrhagic coli can cause haemolytic uraemic syndromeEnteroinvasive coli produces disease similar salmonellosis Enterotoxigenic coli common cause travelers' diarrhoea Enteroinvasive Coli shares many genetic and clinical features with Shigella not salmonella Enterotoxins produced initially induce secretory small-bowel diarrhea Subsequently colonize and invades colonic mucosa resulting development inflammatory colitis characterized fever abdominal pain tenesmus and scant stool containing mucus blood and inflammatory cells Symptoms usually self-limited (7–10 days) Ref: Harrisons Internal Medicine 18th Edition Chapter 149 .......

What the mechanism action cholera toxin the small intestine? ADP-r

Subject :-microbiology

Topic :- clinical microbiology

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Adenosine deaminase deficiency seen the following: Common variable immun

Subject :-microbiology

Topic :- clinical microbiology

Adenosine deaminase deficiency seen following: Common variable immunodeficiencySevere combined immunodeficiency Chronic granulomatous diseaseNezelof syndrome The most common cause Autosomal Recessive Severe Combined Immunodeficiency Disease (SCID) deficiency enzyme adenosine deaminase (ADA) Ref: Text Book Microbilogy Ananthanarayan 8th Edition Pages 146 156 158 Robbins Basic Pathology Page 235 .......

year old man presented with abdominal pain, vomiting and bloody diarrhea,

Subject :-microbiology

Topic :- clinical microbiology

year old man presented with abdominal pain vomiting and bloody diarrhea his stool sample grew Escherichia coli pure culture following serotype coli causative agent hemorrhagic colitis 157:H7 159:H7O 107:H7O 55:H7 Enterohemorrhagic coli O157:H7 serotype coli causing hemorrhagic colitis associated with ingestion undercooked hamburger sprouts unpasteurized milk juice EHEC produces shiga toxin and can cause colitis after incubation period days typically produces watery diarrhea that progress bloody diarrhea after few hours few days Fatigue abdominal pain nausea and vomiting associated complaints Mechanism enterohemorrhagic colitis appears vascular endothelial damage that leads platelet aggregation and initiation the coagulation cascade This turn leads ischemia colon and results hemorrhagic colitis Ref: Mayo Clinic Gastroenterology and Hepatology Board Review Stephen Hauser 4th Edition Page 197 .......

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