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MLT Microbiology Exam Questions with Correct Answers

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MLT Microbiology Exam Questions with Correct Answers What organism is NOT OXIDASE POSITIVE? - Answer-Yersinia enterocolitica Which organisms are oxidase positive? - Answer-Aeromonas hydrophilia, Pseudomonas aeruginosa, Vibrio parahaemolyticus Rice water stools often contain a pure culture o...

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  • September 6, 2024
  • 15
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

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  • mlt microbiology
  • mlt microbiology exam questions
  • what organism is not oxidase positive

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  • MLT Microbiology

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MLT Microbiology Exam Questions
with Correct Answers

What organism is NOT OXIDASE POSITIVE? - Answer-Yersinia enterocolitica

Which organisms are oxidase positive? - Answer-Aeromonas hydrophilia,
Pseudomonas aeruginosa, Vibrio parahaemolyticus

Rice water stools often contain a pure culture of what organism? - Answer-Vibrio
cholerae

What is the reagent used for the string test? - Answer-0.5% sodium deoxcholate

What allows visibility of acid production by oxidizers in oxidation fermentation (OF)
medium? - Answer-peptone content is low

How many tubes of OF media is (are) inoculated, and under what atomospheric
conditions? - Answer-two tubes, one covered with oil so that air is excluded

Which organism is part of the normal flora of the skin? - Answer-Acintobacter
calcoaceticus

Which organism is oxidase positive? - Answer-Pseudomonas aeruginosa

Which organisms are oxidase negative? - Answer-Gardnerella vaginalis, Acinetobacter
calcoaceticus, Stenotrophomonas maltophilia

What is an acceptible anaerobic specimen? - Answer-body fluid submitted in a syringe

Naegler agar is selective medium for which organism? - Answer-Clostridium

Which Gram-negative anaerobe is resistant to penicillin? - Answer-Bacteroides fragilis

what best describes Propionibacterium? - Answer-anaerobic, Gram-positive bacilli

What Clostridium produces a double zone of hemolysis around colonies on blood agar?
- Answer-C. perfringens

Which Clostridium produces spores that are usually round and terminal? - Answer-C.
ramosum

, Which anaerobic, Gram-positive rod produces terminal "tennis racket" spores? -
Answer-Clostridium tetani

What species of Clostridium causes antimicrobial-associated diarrhea? - Answer-C.
Difficile

Which Gram-negative, anaerobic cocci produces a red fluorescence under ultraviolet
light? - Answer-Veillonella

What best describes Peptococcus? - Answer-anaerobic, Gram-positive cocci

What term describes the morphology of organisms that vary in size and shape? -
Answer-pleomorphic

Capsules are the basis of which test? - Answer-serotyping

A mucoid colony on blood agar medium indicates that which characteristic may be
present? - Answer-organism has a capsule

What are dark staining granules called? - Answer-metachromatic

Which organisms are non motile? - Answer-Shigella and Klebsiella

In the bacterial growth cycle, growth ceases because nutrients are exhausted or toxic
metabolic products have accumulated in what phase? - Answer-stationary phase

What genera of bacteria form spores? - Answer-Bacillus, Clostridium

What term is used to describe bacteria that grow in the absence of atmospheric oxygen
and obtain oxygen from oxygen-containing compounds? - Answer-anaerobes

What is the temperature at which bacteria grow best known as? - Answer-optium

On blood sugar plates a small zone of alpha hemolysis surrounded by a zone of beta
hemolysis after refrigeration is known as what type of hemolysis? - Answer-alpha-prime

What is the most effective method of sterilization? - Answer-autoclaving

What is used for quality control for the dry heat oven? - Answer-Bacillus subtilis

Media that cannot be heated can be sterilized by what alternate method? - Answer-
filtration

What disinfectant is the most effective germicide against bacteria, spores tubercle
bacilli, fungi, and viruses? - Answer-chlorine bleach

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