Microbiology Quiz: Bacteriology
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Questions and Answers

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?

    <p>To confirm Corynebacterium diptheriae</p> Signup and view all the answers

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

    <p>Grapefruit-like colonies</p> Signup and view all the answers

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

    <p>To confirm a negative result</p> Signup and view all the answers

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

    <p>C. perfringens</p> 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?

    <p>Peptidoglycan</p> Signup and view all the answers

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

    <p>S. pneumoniae</p> Signup and view all the answers

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

    <p>Flotation</p> Signup and view all the answers

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

    <p>G. vaginalis</p> Signup and view all the answers

    Which automated system is used for susceptibility testing?

    <p>Vitek</p> Signup and view all the answers

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

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

    What is the morphology of Leptospira?

    <p>Spirochete with tight coils and hooked ends</p> Signup and view all the answers

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

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

    Which of the following is NOT a selective media?

    <p>Mueller-Hinton Agar</p> Signup and view all the answers

    What is the function of Safranin in Gram staining?

    <p>Secondary stain (counterstain)</p> Signup and view all the answers

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

    <p>Neisseria meningitidis</p> Signup and view all the answers

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

    <p>Shiga toxin</p> Signup and view all the answers

    Which medium is commonly used to detect H2S production?

    <p>Triple sugar iron agar</p> Signup and view all the answers

    What is the characteristic of Mycobacterium tuberculosis?

    <p>Acid-fast</p> Signup and view all the answers

    Which disease is commonly associated with pigeon droppings?

    <p>Cryptococcosis</p> Signup and view all the answers

    What is the best method for detecting Plasmodium species?

    <p>Both thick and thin smears</p> Signup and view all the answers

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

    <p>Yersinia enterocolitica - diptheriae</p> Signup and view all the answers

    What is the characteristic growth time for rapid growing mycobacteria?

    <p>&lt;7 days</p> Signup and view all the answers

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

    <p>Endospore - reproduction</p> Signup and view all the answers

    What is the characteristic of the helminth egg Trichuris trichiura?

    <p>Bile stained, with bipolar plugs</p> Signup and view all the answers

    What is the characteristic of transmission of Salmonella subgroup III?

    <p>Transmission through pet snakes, lizards, and fish</p> Signup and view all the answers

    Which bacterium is known to cause atypical pneumonia?

    <p>Mycoplasma pneumoniae</p> Signup and view all the answers

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

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

    What is the causative agent of anthrax?

    <p>Bacillus anthracis</p> Signup and view all the answers

    The Quellung reaction is used for serotyping which bacterium?

    <p>Streptococcus pneumoniae</p> Signup and view all the answers

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

    <p>Salmonella typhi</p> Signup and view all the answers

    Which bacterium produces a red pigment?

    <p>Serratia marcescens</p> Signup and view all the answers

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

    <p>Optochin susceptibility test</p> Signup and view all the answers

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

    <p>Mycoplasma hominis</p> Signup and view all the answers

    What is the most common parasite found in the Philippines?

    <p>Ascaris lumbricoides</p> Signup and view all the answers

    What is the purpose of using Oxacillin in susceptibility testing?

    <p>To detect MRSA</p> Signup and view all the answers

    Which of the following bacteria is an obligate intracellular pathogen?

    <p>Chlamydia trachomatis</p> Signup and view all the answers

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

    <p>Budding yeast with a large capsule</p> Signup and view all the answers

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

    <p>Mycobacterium tuberculosis</p> Signup and view all the answers

    What is the causative agent of whooping cough?

    <p>Bordetella pertussis</p> Signup and view all the answers

    What is the purpose of the Ziehl-Neelsen stain?

    <p>To identify acid-fast bacteria</p> Signup and view all the answers

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

    <p>Streptococcus mutans</p> Signup and view all the answers

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

    <p>Lowenstein-Jensen medium</p> Signup and view all the answers

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

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

    What is the causative agent of syphilis?

    <p>Treponema pallidum</p> Signup and view all the answers

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

    <p>Staphylococcus epidermidis</p> Signup and view all the answers

    What is the novobiocin-resistant coagulase-negative staphylococcus?

    <p>Staphylococcus saprophyticus</p> Signup and view all the answers

    Which bacterium exhibits swarming motility on agar plates?

    <p>Proteus mirabilis</p> Signup and view all the answers

    What is the characteristic growth pattern of Mycobacterium tuberculosis?

    <p>Slow growth</p> Signup and view all the answers

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

    <p>Mycoplasma pneumoniae</p> Signup and view all the answers

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

    <p>Contaminated food and water</p> Signup and view all the answers

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

    <p>C. diptheriae</p> Signup and view all the answers

    What is the primary function of Mueller Hinton agar?

    <p>Antimicrobial susceptibility testing</p> Signup and view all the answers

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

    <p>Red color</p> Signup and view all the answers

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

    <p>P. aeruginosa</p> Signup and view all the answers

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

    <p>Methylene blue</p> Signup and view all the answers

    Which of the following bacteria is responsible for epidemic gastroenteritis?

    <p>Norwalk virus</p> Signup and view all the answers

    What type of bacteria grows on MacConkey agar EXCEPT:

    <p>Legionella</p> Signup and view all the answers

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

    <p>Paragonimus spp and D. latum</p> Signup and view all the answers

    Which automated system is used for susceptibility testing:

    <p>Vitek</p> Signup and view all the answers

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

    <p>Nocardia</p> Signup and view all the answers

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

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

    What is the purpose of the Elek test in bacteriology?

    <p>To identify Corynebacterium diptheriae</p> Signup and view all the answers

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

    <p>Clostridium tetani</p> Signup and view all the answers

    What is the primary medium for antimicrobial susceptibility testing?

    <p>Mueller Hinton agar</p> Signup and view all the answers

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

    <p>Development of a red color</p> Signup and view all the answers

    Which bacterium produces Shiga toxin?

    <p>E. coli O157:H7</p> Signup and view all the answers

    Which disease is commonly associated with pigeon droppings?

    <p>Cryptococcosis</p> Signup and view all the answers

    Which Plasmodium species is best detected in?

    <p>Both thick and thin smears</p> Signup and view all the answers

    Which bacterium is responsible for swimmer's ear?

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

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

    <p>Clostridium perfringens</p> Signup and view all the answers

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

    <p>Listeria monocytogenes</p> Signup and view all the answers

    What is the primary use of chocolate agar in microbiology?

    <p>Isolation of Neisseria and Haemophilus</p> Signup and view all the answers

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

    <p>PYR</p> Signup and view all the answers

    Which of the following bacteria is not an enteric pathogen?

    <p>Bacillus cereus</p> Signup and view all the answers

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

    <p>Isolation of Listeria monocytogenes</p> Signup and view all the answers

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

    <p>B. pseudomallei</p> Signup and view all the answers

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

    <p>Escherichia coli</p> Signup and view all the answers

    What is the primary function of Safranin in Gram staining?

    <p>Counterstain</p> Signup and view all the answers

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

    <p>N. meningitides</p> Signup and view all the answers

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

    <p>CAMP</p> Signup and view all the answers

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

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

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

    <p>Leptospira</p> Signup and view all the answers

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

    <p>E. coli O157:H7</p> Signup and view all the answers

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

    <p>Salmonella subgroup III</p> Signup and view all the answers

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

    <p>Staphylococcus aureus</p> Signup and view all the answers

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

    <p>Pseudomonas aeruginosa</p> Signup and view all the answers

    What is the causative agent of anthrax?

    <p>Bacillus anthracis</p> Signup and view all the answers

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

    <p>Vibrio cholerae</p> Signup and view all the answers

    Which bacterium produces a black precipitate on Hektoen enteric agar?

    <p>Salmonella typhi</p> Signup and view all the answers

    What is the purpose of the Quellung reaction?

    <p>To serotype Streptococcus pneumoniae</p> Signup and view all the answers

    Which bacterium is urease positive?

    <p>Proteus mirabilis</p> Signup and view all the answers

    What is the causative agent of atypical pneumonia?

    <p>Mycoplasma pneumoniae</p> Signup and view all the answers

    Which bacterium is known to cause 'fishy' odor?

    <p>Proteus mirabilis</p> Signup and view all the answers

    What is the characteristic of Salmonella typhi?

    <p>Produces a black precipitate on Hektoen enteric agar</p> Signup and view all the answers

    Which bacterium is associated with food poisoning?

    <p>All of the above</p> Signup and view all the answers

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

    <p>Escherichia coli</p> Signup and view all the answers

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

    <p>Oval-shaped with bipolar plugs</p> Signup and view all the answers

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

    <p>Listeria monocytogenes</p> Signup and view all the answers

    Which of the following bacteria produces a Shiga toxin?

    <p>Escherichia coli</p> Signup and view all the answers

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

    <p>Chocolate agar</p> Signup and view all the answers

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