Microbiology Colony Morphology Quiz

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18 Questions

What is the Gram stain result for Aeromonas?


Which bacterial strain produces smooth, convex, translucent colonies?

C. fetus subsp. fetus

What is the definitive identification test for Campylobacter jejuni?

Positive hippurate hydrolysis test

Which bacterial strain demonstrates 'darting' motility?


What is the culture medium used for definitive identification of H. pylori?

Christensen’s urea medium at 37°C

Which indirect test can be used to detect the presence of H. pylori?

Urea Breath Test

Which characteristic is unique to Pseudomonas stutzeri for differentiating it from other Pseudomonas species?

Wrinkled, leathery, adherent colonies

What characteristic is common to Pseudomonas mendocina and Pseudomonas pseudoalcaligenes/alciligenes?

Positive for oxidase and ADH

What is a distinguishing feature of Pseudomonas mendocina compared to other Pseudomonas species?

Production of pyoverdine

What property can be used to differentiate Pseudomonas pseudoalcaligenes from other Pseudomonas species?

Weak ferment fructose

Which feature is indicative of Pseudomonas mosellii among the given options?

Optimal growth at 30°C

What characteristic of Pseudomonas nonfluorescent group helps in distinguishing it from other Pseudomonas species?

Light-yellow or brown pigment

What causes urethritis?

Neisseria gonorrhoeae, Chlamydia trachomatis, or Ureaplasma urealyticum

What is the microscopic morphology associated with gonococcal urethritis?

Gram-negative intracellular diplococci

What is the recommended culture medium for identifying Neisseria gonorrhoeae?

Chocolate Agar Plate

Which biochemical test is used for definitive identification of Neisseria gonorrhoeae?

Oxidase Test

What color change indicates a positive result in the oxidase test for Neisseria gonorrhoeae?

Purple within 10 seconds

Which of the following is NOT a recommended specimen for direct microscopic examination?

Pharyngeal swab

Test your knowledge on identifying bacteria based on colony morphology characteristics such as color, shape, and texture. Questions cover different types of colonies produced by bacteria like runny, spreading, and pigmented colonies.

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