Which stain is used for acid-fast bacteria (AFB) like Mycobacterium tuberculosis?

In Gram staining, the decolorizer used is:

ELISA (Enzyme-Linked Immunosorbent Assay) is based on which principle?

The GOLD STANDARD test for HIV diagnosis (confirmation) is:

Autoclave sterilization uses steam under pressure. The standard autoclave conditions are:

Which media is selective for isolation of Salmonella and Shigella from stool?

India ink preparation is used to identify which organism?

Which hepatitis virus is transmitted by fecal-oral route and causes epidemic jaundice?

KOH (10% potassium hydroxide) wet mount is used to identify:

Which test is used for detection of VDRL and RPR in syphilis screening?

Culture medium TCBS is selective for which organism?

Which test is used to detect Helicobacter pylori non-invasively (without endoscopy)?

The Mantoux test (tuberculin skin test) uses which antigen?

WIDAL test uses which type of serological reaction?

Antibiotic susceptibility testing is routinely done by which method?

Which stain is used for identification of Pneumocystis jirovecii (carinii) in BAL?

Which sterilization method is used for heat-sensitive items (endoscopes, plastic materials)?

Normal vaginal flora is predominantly which organism?

Which test confirms dengue fever in the first 5 days of illness?

Dark-field microscopy is used to identify which organism?

The causative organism of plague is:

Which serological test is used for the diagnosis of infectious mononucleosis (EBV infection)?

Which organism shows satellitism around Staphylococcus aureus colonies on blood agar?

Which test is used to detect latex agglutination for rapid meningitis diagnosis?

Biomedical waste management in India is governed by which guidelines?

Stool examination for Entamoeba histolytica trophozoites shows:

Which test is used to distinguish Streptococcus pyogenes (Group A Strep) from other streptococci?

Blood cultures should be collected at what stage of fever for maximum positivity?

Which test is used to differentiate Staphylococcus aureus from coagulase-negative staphylococci (CoNS)?

What is the window period for HIV infection?

The Loeffler's methylene blue stain demonstrates which characteristic of Corynebacterium diphtheriae?

Which organism is associated with gas gangrene (clostridial myonecrosis)?

Malaria species that stays dormant in liver as hypnozoites are:

The CAMP test is used to identify which organism?

The Quellung reaction is used to identify capsulated bacteria using:

Universal precautions / Standard precautions for infection control include:

Which stain is used for identification of Leishmania donovani (visceral leishmaniasis) in bone marrow or splenic aspirate?

McFarland 0.5 standard used in antibiotic susceptibility testing corresponds to:

Which test differentiates Mycobacterium tuberculosis from non-tuberculous mycobacteria (NTM)?

For quality control in microbiology laboratory, ATCC strains are used. ATCC stands for:

Schistosoma species cause which disease and are diagnosed how?

Which typing method has highest discriminatory power for epidemiological investigation of hospital outbreaks?

The principle of immunofluorescence (IF) microscopy is:

The Elek's test (Immunodiffusion test) is used for:

WHO hand hygiene five moments are:

Which Hepatitis B marker indicates active viral replication and high infectivity?

Microaerophilic organisms like Campylobacter jejuni require what oxygen concentration for growth?

PCR (Polymerase Chain Reaction) amplifies DNA using which key components?

The standard concentration of glutaraldehyde used for high-level disinfection of endoscopes is:

Which organism is responsible for causing whooping cough (pertussis)?

The principle of Western Blot (immunoblot) used in HIV confirmation is:

Which Candida species is intrinsically resistant to fluconazole?

Donovan bodies are the characteristic tissue form of which organism?

The NABH (National Accreditation Board for Hospitals) standards for laboratories emphasize which aspects?

Normal flora of the intestine that can cause opportunistic infections when overgrown:

Which disinfectant is used for skin antisepsis before blood collection?

The catalase test differentiates which organisms?

The Ascoli's thermoprecipitation test is used for diagnosis of which disease?

Direct fluorescent antibody (DFA) test for rabies uses which tissue?

Methicillin-resistant Staphylococcus aureus (MRSA) is detected by which test in routine microbiology?

The concept that infectious diseases are caused by living microscopic organisms (Germ Theory of Disease) was primarily established and propagated by which scientist?

Robert Koch discovered the causative organism for tuberculosis AND which other disease?

Which of the following microorganisms does NOT possess a cell wall?

The cell wall of GRAM-NEGATIVE bacteria contains which of the following unique component NOT found in Gram-positive bacteria?

Regarding ENDOTOXINS (lipopolysaccharides of Gram-negative bacteria), which of the following statements is CORRECT?

Which of the following statements about EXOTOXINS is CORRECT?

Exotoxins are produced by which of the following organisms?

Regarding bacterial FIMBRIAE (pili), all of the following are correct EXCEPT:

The characteristic DARTING motility seen in Vibrio cholerae is ALSO found in which other organism?

Regarding the bacterial CAPSULE, all of the following statements are true EXCEPT:

The EUKARYOTIC cell membrane does NOT typically contain which of the following components?

Metachromatic granules (volutin granules, Babes-Ernst granules) are seen in all of the following organisms EXCEPT:

Negative staining demonstrates the bacterial CAPSULE while positive (direct) staining does not demonstrate it well. This is because the capsule is primarily composed of:

Silver impregnation method of staining is used to demonstrate which of the following bacterial structures?

The Quellung reaction is associated with which of the following phenomena?

During which phase of bacterial growth is there a CONSTANT and MAXIMUM rate of increase in bacterial numbers?

All of the following organisms are microaerophilic (grow best at reduced oxygen tensions of 5–10%) EXCEPT:

An outbreak of staphylococcal infections in a neonatal nursery involves seven newborns' umbilical cords. Two nurses have heavy nasal carriage of Staphylococcus aureus. To determine whether these nurses are the SOURCE of the outbreak, which test is most appropriate?

The BEST method of sterilization using dry heat is which of the following?

TYNDALLIZATION is a method of sterilization that uses which type of heat?

Hot air oven sterilization is suitable for all of the following EXCEPT:

The accuracy and effectiveness of PLASMA STERILIZATION is best assessed using which biological indicator organism?

Chlorination (water chlorination) is effective against all of the following microorganisms EXCEPT:

For sterilization in a hot air oven, the holding time at 160°C is:

Bacterial resistance to antibiotics is MOST COMMONLY transmitted between bacteria through which mechanism?

A SELECTIVE medium in microbiology is best described as which of the following?

Löffler's medium belongs to which category of culture media?

Culture media are sterilized by which of the following methods?

Which of the following organisms is CATALASE POSITIVE AND OXIDASE NEGATIVE?

In early PCR experiments, E. coli DNA polymerase was used but was later replaced by TAQ polymerase from Thermus aquaticus. What is the PRIMARY advantage of using TAQ polymerase?

In Auramine-phenol fluorescent staining for Mycobacteria, which solution is used as the DIFFERENTIATING (decolorizing) agent?

In which bacterial group do the granules in the CYTOPLASM serve as a key IDENTIFICATION feature?

In Neisser's staining of bacteria, which part stains BLUE-BLACK in color?

NEGATIVE STAINING technique is most commonly used for identification and visualization of which of the following?

Using Hiss's method of capsule staining, the capsule stains which COLOR?

Malachite green stain is used for identification of which bacterial structure?

In Fuchsin-Nigrosin spore staining, which solution is used as the COUNTERSTAIN?

In BACTERIAL CELL WALL STAINING, which solution is used as a MORDANT?

In Fontana's silver method of staining, flagella appear in which COLOR?

In which method of spirochete staining do spirochetes take a BROWNISH-BLACK color?

Who was the FIRST to observe and report bacteria under a microscope?

Who introduced STAINING TECHNIQUES and the method of obtaining bacteria in PURE CULTURE using solid media?

In 1879, which scientist described GONOCOCCUS and what type of cocci did he describe?

In which year did Schaudinn and Hoffmann discover the SPIROCHETE of SYPHILIS (Treponema pallidum)?

Which type of bacteria forms BRANCHING FILAMENTOUS structures resembling fungi?

Cocci arranged in GROUPS OF FOUR are called:

On the cell wall of GRAM-NEGATIVE bacteria, which component is responsible for their ENDOTOXIC ACTIVITY and ANTIGEN SPECIFICITY?

The cytoplasmic membrane of bacteria consists of lipoprotein along with small amounts of which component?

The specific ENZYMES present on the cytoplasmic membrane of bacteria responsible for TRANSPORT of nutrients into the cell are known as:

Which part of the bacterial cell is CHARACTERISTIC for different bacterial species and varies depending on the AGE and CONDITION of the culture?