Microbiology Quiz: Bacteriology

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Which bacterium is characterized by a 'tackhead' appearance due to a swollen terminal spore?

Clostridium botulinum

Yersinia

Bacillus anthracis

Clostridium tetani (correct)

What is the characteristic appearance of Corynebacterium diptheriae under a microscope?

Pleomorphic, resembling a 'Chinese character' (correct)

Rod-shaped, gram-negative

Spiral-shaped, gram-positive

Lancet-shaped, catalase negative

What is the selective medium for Pseudomonas aeruginosa?

Mueller Hinton agar

Cetrimide agar (correct)

Chocolate agar

MacConkey agar

What is the purpose of the Elek test?

To confirm Corynebacterium diptheriae Signup and view all the answers

What is the characteristic appearance of Pseudomonas aeruginosa on MacConkey agar?

Grapefruit-like colonies Signup and view all the answers

What is the purpose of adding zinc dust to a nitrate reduction test?

To confirm a negative result Signup and view all the answers

Which of the following organisms is a gram-positive bacterium?

C. perfringens Signup and view all the answers

What is the primary component of the cell wall in gram-positive bacteria that is stained by Gram stain?

Peptidoglycan Signup and view all the answers

Which of the following bacteria is known for its ability to grow in slightly acidic pH?

S. pneumoniae Signup and view all the answers

What is the term for the ability of bacteria to float in a zinc sulfate solution?

Flotation Signup and view all the answers

Which of the following bacteria is known for its characteristic 'fishy' odor?

G. vaginalis Signup and view all the answers

Which automated system is used for susceptibility testing?

Vitek Signup and view all the answers

What is the purpose of the ONPG test in laboratory diagnosis?

To determine if an organism is a late lactose fermenter or a true non-lactose fermenter Signup and view all the answers

What is the morphology of Leptospira?

Spirochete with tight coils and hooked ends Signup and view all the answers

What is the purpose of the Citrate Utilization Test (Simmon's Citrate Test)?

To identify bacteria based on their ability to utilize citrate as a source of carbon Signup and view all the answers

Which of the following is NOT a selective media?

Mueller-Hinton Agar Signup and view all the answers

What is the function of Safranin in Gram staining?

Secondary stain (counterstain) Signup and view all the answers

Which of the following bacteria is NOT associated with food poisoning?

Neisseria meningitidis Signup and view all the answers

What type of toxin is produced by E. coli O157:H7?

Shiga toxin Signup and view all the answers

Which medium is commonly used to detect H2S production?

Triple sugar iron agar Signup and view all the answers

What is the characteristic of Mycobacterium tuberculosis?

Acid-fast Signup and view all the answers

Which disease is commonly associated with pigeon droppings?

Cryptococcosis Signup and view all the answers

What is the best method for detecting Plasmodium species?

Both thick and thin smears Signup and view all the answers

Which of the following bacteria is mismatched with its corresponding disease?

Yersinia enterocolitica - diptheriae Signup and view all the answers

What is the characteristic growth time for rapid growing mycobacteria?

<7 days Signup and view all the answers

Which of the following is a mismatched characteristic of bacterial structures?

Endospore - reproduction Signup and view all the answers

What is the characteristic of the helminth egg Trichuris trichiura?

Bile stained, with bipolar plugs Signup and view all the answers

What is the characteristic of transmission of Salmonella subgroup III?

Transmission through pet snakes, lizards, and fish Signup and view all the answers

Which bacterium is known to cause atypical pneumonia?

Mycoplasma pneumoniae Signup and view all the answers

Which of the following gram-negative bacilli is oxidase positive and has a characteristic grape-like odor?

Pseudomonas aeruginosa Signup and view all the answers

What is the causative agent of anthrax?

Bacillus anthracis Signup and view all the answers

The Quellung reaction is used for serotyping which bacterium?

Streptococcus pneumoniae Signup and view all the answers

Which enteric pathogen produces a black precipitate on Hektoen enteric agar?

Salmonella typhi Signup and view all the answers

Which bacterium produces a red pigment?

Serratia marcescens Signup and view all the answers

What is the best test for the presumptive identification of S.pneumoniae?

Optochin susceptibility test Signup and view all the answers

Which organism is commonly isolated from urethral discharge and has a fried egg appearance on culture?

Mycoplasma hominis Signup and view all the answers

What is the most common parasite found in the Philippines?

Ascaris lumbricoides Signup and view all the answers

What is the purpose of using Oxacillin in susceptibility testing?

To detect MRSA Signup and view all the answers

Which of the following bacteria is an obligate intracellular pathogen?

Chlamydia trachomatis Signup and view all the answers

What is the appearance of Cryptococcus neoformans on an India ink preparation?

Budding yeast with a large capsule Signup and view all the answers

Which of the following bacteria produces an acid-fast toxin?

Mycobacterium tuberculosis Signup and view all the answers

What is the causative agent of whooping cough?

Bordetella pertussis Signup and view all the answers

What is the purpose of the Ziehl-Neelsen stain?

To identify acid-fast bacteria Signup and view all the answers

Which of the following bacteria is commonly associated with dental caries?

Streptococcus mutans Signup and view all the answers

What is the primary medium for the cultivation of Mycobacterium tuberculosis?

Lowenstein-Jensen medium Signup and view all the answers

Which bacterium is known to produce a blue-green pigment?

Pseudomonas aeruginosa Signup and view all the answers

What is the causative agent of syphilis?

Treponema pallidum Signup and view all the answers

Which bacterium is commonly associated with biofilm formation on medical devices?

Staphylococcus epidermidis Signup and view all the answers

What is the novobiocin-resistant coagulase-negative staphylococcus?

Staphylococcus saprophyticus Signup and view all the answers

Which bacterium exhibits swarming motility on agar plates?

Proteus mirabilis Signup and view all the answers

What is the characteristic growth pattern of Mycobacterium tuberculosis?

Slow growth Signup and view all the answers

Which of the following bacteria is known to cause atypical pneumonia?

Mycoplasma pneumoniae Signup and view all the answers

What is the primary mode of transmission for Salmonella subgroup III?

Contaminated food and water Signup and view all the answers

Which of the following bacteria is characterized by a metachromatic granule?

C. diptheriae Signup and view all the answers

What is the primary function of Mueller Hinton agar?

Antimicrobial susceptibility testing Signup and view all the answers

What is the result of a positive nitrate reduction test after addition of zinc dust?

Red color Signup and view all the answers

Which of the following bacteria is characterized by a 'grape-fruit' appearance on MacConkey agar?

P. aeruginosa Signup and view all the answers

Which of the following stains is used to detect metachromatic granules in C. diptheriae?

Methylene blue Signup and view all the answers

Which of the following bacteria is responsible for epidemic gastroenteritis?

Norwalk virus Signup and view all the answers

What type of bacteria grows on MacConkey agar EXCEPT:

Legionella Signup and view all the answers

Which of the following helminth eggs do not float in zinc sulfate solution:

Paragonimus spp and D. latum Signup and view all the answers

Which automated system is used for susceptibility testing:

Vitek Signup and view all the answers

Which bacteria has branched hyphae and is transmitted through inhalation of soil/dust:

Nocardia Signup and view all the answers

Which bacterium can be characterized by a 'grape-fruit' appearance in MacConkey agar?

Pseudomonas aeruginosa Signup and view all the answers

What is the purpose of the Elek test in bacteriology?

To identify Corynebacterium diptheriae Signup and view all the answers

Which of the following bacteria is characterized by a 'tackhead' appearance due to a swollen terminal spore?

Clostridium tetani Signup and view all the answers

What is the primary medium for antimicrobial susceptibility testing?

Mueller Hinton agar Signup and view all the answers

What is the result of adding zinc dust to a negative nitrate reduction test?

Development of a red color Signup and view all the answers

Which bacterium produces Shiga toxin?

E. coli O157:H7 Signup and view all the answers

Which disease is commonly associated with pigeon droppings?

Cryptococcosis Signup and view all the answers

Which Plasmodium species is best detected in?

Both thick and thin smears Signup and view all the answers

Which bacterium is responsible for swimmer's ear?

Pseudomonas aeruginosa Signup and view all the answers

Which organism has a double zone of hemolysis on blood agar?

Clostridium perfringens Signup and view all the answers

Which of the following bacteria exhibits tumbling motility at room temperature?

Listeria monocytogenes Signup and view all the answers

What is the primary use of chocolate agar in microbiology?

Isolation of Neisseria and Haemophilus Signup and view all the answers

Which of the following tests is used to differentiate between group D streptococcus and enterococcus?

PYR Signup and view all the answers

Which of the following bacteria is not an enteric pathogen?

Bacillus cereus Signup and view all the answers

What is the primary purpose of a cold enrichment technique in microbiology?

Isolation of Listeria monocytogenes Signup and view all the answers

Which of the following bacteria is associated with melioidosis, a disease also known as the 'Vietnamese time bomb'?

B. pseudomallei Signup and view all the answers

Which of the following bacterial colonies is characterized by a green metallic sheen on EMB agar?

Escherichia coli Signup and view all the answers

What is the primary function of Safranin in Gram staining?

Counterstain Signup and view all the answers

Which of the following bacteria is NOT associated with food poisoning?

N. meningitides Signup and view all the answers

Which of the following bacteria produces a characteristic 'arrowhead' shape on agar plates?

CAMP Signup and view all the answers

Which bacterium is responsible for the production of a yellow-green pigment?

Pseudomonas aeruginosa Signup and view all the answers

Which of the following bacteria is commonly associated with the transmission of diseases through contaminated water?

Leptospira Signup and view all the answers

Which bacterium is known to produce a toxin that causes a severe bloody diarrhea?

E. coli O157:H7 Signup and view all the answers

Which of the following bacteria is capable of metabolizing citrate as a sole source of carbon?

Salmonella subgroup III Signup and view all the answers

Which bacterium is known to produce a beta-lactamase enzyme that makes it resistant to penicillin?

Staphylococcus aureus Signup and view all the answers

Which bacterium is characterized by producing a grape-like odor and is oxidase positive?

Pseudomonas aeruginosa Signup and view all the answers

What is the causative agent of anthrax?

Bacillus anthracis Signup and view all the answers

Which bacterium is responsible for 'rice-water stool'?

Vibrio cholerae Signup and view all the answers

Which bacterium produces a black precipitate on Hektoen enteric agar?

Salmonella typhi Signup and view all the answers

What is the purpose of the Quellung reaction?

To serotype Streptococcus pneumoniae Signup and view all the answers

Which bacterium is urease positive?

Proteus mirabilis Signup and view all the answers

What is the causative agent of atypical pneumonia?

Mycoplasma pneumoniae Signup and view all the answers

Which bacterium is known to cause 'fishy' odor?

Proteus mirabilis Signup and view all the answers

What is the characteristic of Salmonella typhi?

Produces a black precipitate on Hektoen enteric agar Signup and view all the answers

Which bacterium is associated with food poisoning?

All of the above Signup and view all the answers

Which of the following bacteria is primarily transmitted through contaminated food and water?

Escherichia coli Signup and view all the answers

What is the characteristic morphology of the helminth egg Trichuris trichiura?

Oval-shaped with bipolar plugs Signup and view all the answers

Which of the following bacteria exhibits tumbling motility at room temperature?

Listeria monocytogenes Signup and view all the answers

Which of the following bacteria produces a Shiga toxin?

Escherichia coli Signup and view all the answers

Which of the following media is primarily used for the isolation of Neisseria and Haemophilus?

Chocolate agar Signup and view all the answers

Microbiology Quiz: Bacteriology

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Questions and Answers

Which bacterium is characterized by a 'tackhead' appearance due to a swollen terminal spore?

What is the characteristic appearance of Corynebacterium diptheriae under a microscope?

What is the selective medium for Pseudomonas aeruginosa?

What is the purpose of the Elek test?

What is the characteristic appearance of Pseudomonas aeruginosa on MacConkey agar?

What is the purpose of adding zinc dust to a nitrate reduction test?

Which of the following organisms is a gram-positive bacterium?

What is the primary component of the cell wall in gram-positive bacteria that is stained by Gram stain?

Which of the following bacteria is known for its ability to grow in slightly acidic pH?

What is the term for the ability of bacteria to float in a zinc sulfate solution?

Which of the following bacteria is known for its characteristic 'fishy' odor?

Which automated system is used for susceptibility testing?

What is the purpose of the ONPG test in laboratory diagnosis?

What is the morphology of Leptospira?

What is the purpose of the Citrate Utilization Test (Simmon's Citrate Test)?

Which of the following is NOT a selective media?

What is the function of Safranin in Gram staining?

Which of the following bacteria is NOT associated with food poisoning?

What type of toxin is produced by E. coli O157:H7?

Which medium is commonly used to detect H2S production?

What is the characteristic of Mycobacterium tuberculosis?

Which disease is commonly associated with pigeon droppings?

What is the best method for detecting Plasmodium species?

Which of the following bacteria is mismatched with its corresponding disease?

What is the characteristic growth time for rapid growing mycobacteria?

Which of the following is a mismatched characteristic of bacterial structures?

What is the characteristic of the helminth egg Trichuris trichiura?

What is the characteristic of transmission of Salmonella subgroup III?

Which bacterium is known to cause atypical pneumonia?

Which of the following gram-negative bacilli is oxidase positive and has a characteristic grape-like odor?

What is the causative agent of anthrax?

The Quellung reaction is used for serotyping which bacterium?

Which enteric pathogen produces a black precipitate on Hektoen enteric agar?

Which bacterium produces a red pigment?

What is the best test for the presumptive identification of S.pneumoniae?

Which organism is commonly isolated from urethral discharge and has a fried egg appearance on culture?

What is the most common parasite found in the Philippines?

What is the purpose of using Oxacillin in susceptibility testing?

Which of the following bacteria is an obligate intracellular pathogen?

What is the appearance of Cryptococcus neoformans on an India ink preparation?

Which of the following bacteria produces an acid-fast toxin?

What is the causative agent of whooping cough?

What is the purpose of the Ziehl-Neelsen stain?

Which of the following bacteria is commonly associated with dental caries?

What is the primary medium for the cultivation of Mycobacterium tuberculosis?

Which bacterium is known to produce a blue-green pigment?

What is the causative agent of syphilis?

Which bacterium is commonly associated with biofilm formation on medical devices?

What is the novobiocin-resistant coagulase-negative staphylococcus?

Which bacterium exhibits swarming motility on agar plates?

What is the characteristic growth pattern of Mycobacterium tuberculosis?

Which of the following bacteria is known to cause atypical pneumonia?

What is the primary mode of transmission for Salmonella subgroup III?

Which of the following bacteria is characterized by a metachromatic granule?

What is the primary function of Mueller Hinton agar?

What is the result of a positive nitrate reduction test after addition of zinc dust?

Which of the following bacteria is characterized by a 'grape-fruit' appearance on MacConkey agar?

Which of the following stains is used to detect metachromatic granules in C. diptheriae?

Which of the following bacteria is responsible for epidemic gastroenteritis?

What type of bacteria grows on MacConkey agar EXCEPT:

Which of the following helminth eggs do not float in zinc sulfate solution:

Which automated system is used for susceptibility testing:

Which bacteria has branched hyphae and is transmitted through inhalation of soil/dust:

Which bacterium can be characterized by a 'grape-fruit' appearance in MacConkey agar?

What is the purpose of the Elek test in bacteriology?

Which of the following bacteria is characterized by a 'tackhead' appearance due to a swollen terminal spore?

What is the primary medium for antimicrobial susceptibility testing?

What is the result of adding zinc dust to a negative nitrate reduction test?

Which bacterium produces Shiga toxin?

Which disease is commonly associated with pigeon droppings?

Which Plasmodium species is best detected in?

Which bacterium is responsible for swimmer's ear?

Which organism has a double zone of hemolysis on blood agar?

Which of the following bacteria exhibits tumbling motility at room temperature?

What is the primary use of chocolate agar in microbiology?

Which of the following tests is used to differentiate between group D streptococcus and enterococcus?

Which of the following bacteria is not an enteric pathogen?