MCQs of MicroBiology – Bacteriology

The causative organism of syphilis is:

On a stained slide, clostridium tetani has the appearance of a:

An oxidase-positive, gram-negative rod which produces a bluish-green pigment has been grown in culture from a swab obtained from an infected burn wound. This organism is susceptible to gentamicin, ticarcillin and tobramicin, but resistant to all the other antibiotics which of the following organisms is it likely to be?

In initial stages of tyhoid, salmonella can be detected in:

Bacteria reproduce mainly by:

Signs of tyhoid fever is/are

All of the following are true of streptococcus except:

The structure in involved in bacterial attachment to cell surface is:

The specific test for Treponema pallidum is:

Electron microscopic examination of the bacterial flora of necrotising ulcerative gingivitis indicates the presence of microorganisms within non-necrotic tissues in advance of other bacteria. The organisms involved are:

The difference between gram positive and negative bacteria lies in their

The following are applicable to bacterial genoms except:

The commonest method of detection of diptheria carriers is:

Each of the following can cause food poisoning except:

Toxic shock syndrome is due to the following virulence factor:

The bacterial cell wall has all of the following properties except:

Endotoxin have all but one of the properties given below:

Anaerobic bacteria grow

Organ of locomotion in bacteria is:

Phage conversion is required for:

For uniform staining reaction, morphology and biochemical activity it is advisable to study bacterial cultures during the:

Wasserman test test is diagnostic of:

One of the following is a treponemal test for diagnosis of syphilis:

Bacteria with potent exotoxin is:

The genetic ability of a bacterium to grow in the presence of several antibiotics is passed in vivo from one bacterium to another by:

Bacteria acquire characteristics by all of the following except:

The virulence factors of Neisseria gonorrhea include all of the following except:

Which of the following enzyme is required to induce the formation of a plasma clot pathogenic staphylococci:

In a patient with typhoid, diagnosis after 15 days of onset of fever is best done by:

Grape bunch shaped colonies are seen in:

Staphylococci typically occur in:

which of the following is anaerobic

One of the following is an agglutination test in the diagnosis of typhoid:

Inactivated microorganisms are used in the manufacture of which of the following

Which regards to temperature requirement, most pathogenic bacteria are:

The major intestinal pathogens which are non-lactose fermenters are:

A protoplast is best characterized as a bacterial cell:

Malignant pustule is referred to:

Causative agents of Vincent’s angina

Resistance of Staphylococcus aureus is due to:

Group A B-hemolytic streptococcal infection of the pharynx may be followed in some by:

Common inhabitant of throat and tonsils is

Which of the following is an acid-fast bacillus

One of the following is a zoonotic disease

Diphtheria is pathogenic only when infected with

The facultative anaerobic bacteria are those who are:

The most common site where organisms are present in a typhoid carrier is:

Actinomycosis is caused by:

Gram -ve bacteria stain during gram staining:

The special stain used for treponema pallidum is:

Silver impregnation method of staining is useful to demonstrate

Staphylococcal bacteria are:

The temperature required for cultivating mycobacterium

Nagglers reaction is used in the diagnosis of:

Salmonella typhi can be isolated at different times from:

Loss of capsule in bacteria is generally associated with:

Which of the following characteristics of bacteria is not true?

Which of the following structures, found external to the bacterial cell wall, are involved in bacterial attachment to cell surfaces?

The single most important laboratory test for determining the virulence of staphylococci is:

Encapsulation in bacteria helps in:

Which of the following have the capability to produce extra cellular polysaccharides

Neurotoxin of tetanus acts on:

Tuberculin test screens for:

Organism most frequently associated with urinary tract infections is:

Granules in the corynebacterium diphtheria are called by following names, except:

Growth factor needed for Salmonella

Widal test is specific for:

Subacute bacterial endocarditis is caused by:

Thumb print appearance in culture film smear is seen

The diagnosis of gonorrhea is established by:

Culture medium for corynebacterium diphtheria

Which of the following are non-spore forming anaerobic bacteria that asume major significance in disease processes

Virulence of Gonococcus is due to:

What is the transport medium for cholera

Vibrio cholera was discovered by:

Which organism causes prosthetic valve endocarditis within 60 days of surgery

Staphylococcus does not causes

The diagnostic investigation for syphilis is:

True about VDRL test:

False +ve for VDRL is seen in:

Actinomycetes is:

Rickettsiae

Q fever is caused by:

Causative organism for gas gangrene

Drumstick appearance is seen in:

Opacity around colonies of Clostridium perfringens is due to:

Nagglers reaction detects

Commonest mycobacterial infection in tropical countries

In T.B cell mediated immunity is by:

Rapid diagnosis of Tuberculosis is possible with

Mycobacterium tuberculosis is differentiated from other atypical mycobacteria by:

Leprosy bacilli can be grown in:

Leprosy bacilli are transmitted from person to person by all except:

Streptococcus is classified based on:

Lancefields classification of B hemolytic streptococcus is based on:

Pneumococus can be differentiated from streptococcus by:

Chlamydia causes all of the following except:

A veterinary doctor had pyrexia of unknown origin His blood culture in special laboratory media was positive for gram negative short bacilli which was oxidase positive. Which one of the following is the likely organism grown in culture?

All of the following organisms are known to survive intracellularly except:

All of the following lab tests can be used to distinguish streptococcus mutans from other oral streptococci, except:

Bacteria acquire characteristics by all the following except:

Borelia vincenti is a:

Borrelia vincenti is always associated with:

Pathogenic treponemas can be maintained in:

Polypeptide capsule is seen in:

Negative staining is used to demonstrate

Teichoic acid is present in cell walls of:

The most common pathogens responsible for nosocomial pneumonias in the ICU are:

Pasteur developed the vaccine for:

Test for differentiating virulent form non-virulent tubercular bacilli:

Culture medium used for Bordatella pertussis is:

Cough plate method is used to identify:

A diabetic patient developed cellulitis due to staphylococcus aureus, which was found to be Methicillin resistant on the antibiotic sensitivity testing. All of the following antibiotics will be appropriate EXCEPT:

cAMP reaction is shown by which streptococci?

Antigen used in Weil-Felix reaction:

The mechanism of genetic transfer where a phage serves as a vehicle is:

The most primitive mode of gene transfer occurs by:

Fimbriae are demonstrated by?

A 6 year old boy comes with abdominal pain, vomiting after consuming mild products within 6 hours. The most likely organism responsible is:

Staphylococcal food poisoning includes the following features:

Staphylococcal toxic shock syndrome (SSS syndrome) is due to:

Phospholipid used to investigate syphilis by the reagin test is:

Which of the following is obligate aerobe?

In small intestine, cholera toxin acts by:

Erysipelas is caused by:

The most frequently encountered clostridial species in gas gangrene is:

The causative organism for cat-scratch disease is:

Group A carbohydrate of Str. pyogenes cross reacts with human

Which one of the following enteric organisms is anaerogenic and non motile?

tThe commonly used fluorescent dye in the detection of tubercie bacilli

An elderly male patient presented with fever, chest pain, and dry cough, sputum culture showed growth on charcoal yeast Extract Medium, theorganism is:

ASO (Antistreptolysin 0) test is uesd for the diagnosis of:

Bacterial species which is protective or beneficial to the host is:

Following are the characteristics of Vincent’s angina EXCEPT:

The spirochete which is associated with fusospirochetosis is:

Pathogenesis of diphtheria is attributed to:

Mycobacterium tuberculosis is best demonstrated by:

Leptospirosis, all are true except:

Dental Plaque adheres to tooth surface by:

All are true about widel test except:

About N. gonorrhoea, all are true except:

Lepromin test is useful for:

About Bacteroids True are all Except:

About Psedomonas. All are true except:

Which is not true about vibrio cholera

Salivary peroxidise system is known to be effective agianst

Pseudomonas aeruginosa

A full course of immunization agianst. Telanus with 3 doses to Tetanus toxoid, confers immunity for how many years?

Which of the following is true about tetanus acquired through traumatic wound?

All are true about bordetella pertussis except:

Actinomycosis is a:

Black pigmented anaerobes include all of the following except:

Each of the following viruses possesses an outer lipoprotein envelope except:

Among The infectious diseases transmitted by food, one is:

All are true about legionella pneumophilia except:

Which of the following fulfil all the criterias of kich’s postulates?

The urine sample of a patient has been sent to the laboratory to look for Leptospira. The specimen is to be screened by use of the: