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Microbiology Quiz: Bacteriology

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103 Questions

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

Clostridium tetani

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

Pleomorphic, resembling a 'Chinese character'

What is the selective medium for Pseudomonas aeruginosa?

Cetrimide agar

What is the purpose of the Elek test?

To confirm Corynebacterium diptheriae

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

Grapefruit-like colonies

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

To confirm a negative result

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

C. perfringens

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

Peptidoglycan

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

S. pneumoniae

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

Flotation

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

G. vaginalis

Which automated system is used for susceptibility testing?

Vitek

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

What is the morphology of Leptospira?

Spirochete with tight coils and hooked ends

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

Which of the following is NOT a selective media?

Mueller-Hinton Agar

What is the function of Safranin in Gram staining?

Secondary stain (counterstain)

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

Neisseria meningitidis

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

Shiga toxin

Which medium is commonly used to detect H2S production?

Triple sugar iron agar

What is the characteristic of Mycobacterium tuberculosis?

Acid-fast

Which disease is commonly associated with pigeon droppings?

Cryptococcosis

What is the best method for detecting Plasmodium species?

Both thick and thin smears

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

Yersinia enterocolitica - diptheriae

What is the characteristic growth time for rapid growing mycobacteria?

<7 days

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

Endospore - reproduction

What is the characteristic of the helminth egg Trichuris trichiura?

Bile stained, with bipolar plugs

What is the characteristic of transmission of Salmonella subgroup III?

Transmission through pet snakes, lizards, and fish

Which bacterium is known to cause atypical pneumonia?

Mycoplasma pneumoniae

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

Pseudomonas aeruginosa

What is the causative agent of anthrax?

Bacillus anthracis

The Quellung reaction is used for serotyping which bacterium?

Streptococcus pneumoniae

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

Salmonella typhi

Which bacterium produces a red pigment?

Serratia marcescens

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

Optochin susceptibility test

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

Mycoplasma hominis

What is the most common parasite found in the Philippines?

Ascaris lumbricoides

What is the purpose of using Oxacillin in susceptibility testing?

To detect MRSA

Which of the following bacteria is an obligate intracellular pathogen?

Chlamydia trachomatis

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

Budding yeast with a large capsule

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

Mycobacterium tuberculosis

What is the causative agent of whooping cough?

Bordetella pertussis

What is the purpose of the Ziehl-Neelsen stain?

To identify acid-fast bacteria

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

Streptococcus mutans

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

Lowenstein-Jensen medium

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

Pseudomonas aeruginosa

What is the causative agent of syphilis?

Treponema pallidum

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

Staphylococcus epidermidis

What is the novobiocin-resistant coagulase-negative staphylococcus?

Staphylococcus saprophyticus

Which bacterium exhibits swarming motility on agar plates?

Proteus mirabilis

What is the characteristic growth pattern of Mycobacterium tuberculosis?

Slow growth

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

Mycoplasma pneumoniae

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

Contaminated food and water

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

C. diptheriae

What is the primary function of Mueller Hinton agar?

Antimicrobial susceptibility testing

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

Red color

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

P. aeruginosa

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

Methylene blue

Which of the following bacteria is responsible for epidemic gastroenteritis?

Norwalk virus

What type of bacteria grows on MacConkey agar EXCEPT:

Legionella

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

Paragonimus spp and D. latum

Which automated system is used for susceptibility testing:

Vitek

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

Nocardia

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

Pseudomonas aeruginosa

What is the purpose of the Elek test in bacteriology?

To identify Corynebacterium diptheriae

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

Clostridium tetani

What is the primary medium for antimicrobial susceptibility testing?

Mueller Hinton agar

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

Development of a red color

Which bacterium produces Shiga toxin?

E. coli O157:H7

Which disease is commonly associated with pigeon droppings?

Cryptococcosis

Which Plasmodium species is best detected in?

Both thick and thin smears

Which bacterium is responsible for swimmer's ear?

Pseudomonas aeruginosa

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

Clostridium perfringens

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

Listeria monocytogenes

What is the primary use of chocolate agar in microbiology?

Isolation of Neisseria and Haemophilus

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

PYR

Which of the following bacteria is not an enteric pathogen?

Bacillus cereus

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

Isolation of Listeria monocytogenes

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

B. pseudomallei

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

Escherichia coli

What is the primary function of Safranin in Gram staining?

Counterstain

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

N. meningitides

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

CAMP

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

Pseudomonas aeruginosa

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

Leptospira

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

E. coli O157:H7

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

Salmonella subgroup III

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

Staphylococcus aureus

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

Pseudomonas aeruginosa

What is the causative agent of anthrax?

Bacillus anthracis

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

Vibrio cholerae

Which bacterium produces a black precipitate on Hektoen enteric agar?

Salmonella typhi

What is the purpose of the Quellung reaction?

To serotype Streptococcus pneumoniae

Which bacterium is urease positive?

Proteus mirabilis

What is the causative agent of atypical pneumonia?

Mycoplasma pneumoniae

Which bacterium is known to cause 'fishy' odor?

Proteus mirabilis

What is the characteristic of Salmonella typhi?

Produces a black precipitate on Hektoen enteric agar

Which bacterium is associated with food poisoning?

All of the above

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

Escherichia coli

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

Oval-shaped with bipolar plugs

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

Listeria monocytogenes

Which of the following bacteria produces a Shiga toxin?

Escherichia coli

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

Chocolate agar

This quiz assesses knowledge of various bacteria, including their characteristics and identification. Test your skills in microbiology!

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