ATI RN
mastering microbiology test bank Questions
Question 1 of 5
Which of the following statements about in vitro cultivation of viruses is true?
Correct Answer: B
Rationale: The correct answer is B because viruses can indeed be cultured on hen embryos, cell cultures, and experimental animals in vitro. This method allows for the replication and study of viruses outside the host organism. Option A is incorrect as viral cultivation is possible in laboratory settings. Option C is incorrect because while viruses can be grown on nutrient media, it is not the only method. Option D is incorrect as viruses can be cultured in various types of cell cultures, not just human embryonic ones.
Question 2 of 5
Which bacterial structure helps in the movement towards or away from chemical stimuli?
Correct Answer: A
Rationale: Flagella are the correct answer because they are long, whip-like structures that aid in bacterial movement towards or away from chemical stimuli. They rotate like propellers, allowing the bacterium to navigate its environment. Pili are used for attachment, not movement. Capsules are involved in protection and adherence, not chemotaxis. Fimbriae help in attachment to surfaces, not in movement towards stimuli.
Question 3 of 5
Treponemae are motile because of:
Correct Answer: A
Rationale: The correct answer is A: axial filaments. Treponemae are motile due to their unique structure of axial filaments, also known as endoflagella. These axial filaments are located within the periplasmic space of the organism and are responsible for the corkscrew-like motility of Treponemae. The other choices (B: mans peritrichous filaments, C: single monotrichous filament, D: fimbriae) do not play a role in the motility of Treponemae. Peritrichous filaments and single monotrichous filaments are not present in Treponemae, and fimbriae are primarily involved in adhesion rather than motility.
Question 4 of 5
Bypass fume hoods belong to the group of
Correct Answer: A
Rationale: The correct answer is A: general-purpose hoods. Bypass fume hoods are designed to handle a wide range of chemical fumes and vapors, making them suitable for various types of experiments and processes. They are not specifically designed for radioisotopes (B), perchloric acid (C), or biological materials (D). Therefore, A is the correct choice for bypass fume hoods.
Question 5 of 5
A patient of surgical department complains about pain in the small of her back and in the lower part of her belly; painful and frequent urination. Bacteriological examination of urine revealed gram-negative oxidase-positive rod-like bacteria forming greenish mucoid colonies with specific smell. What causative agent can it be?
Correct Answer: B
Rationale: The correct answer is B: Proteus mirabilis. This bacterium is known to cause urinary tract infections (UTIs) and matches the description given in the question. Proteus mirabilis is a gram-negative rod-like bacterium that forms greenish mucoid colonies with a specific smell due to its production of urease enzyme. This enzyme leads to the formation of struvite crystals, which can cause painful and frequent urination. Pseudomonas aeruginosa (A) is not typically associated with UTIs. E.coli (C) is the most common cause of UTIs but does not match the specific description provided. Str.pyogenes (D) is a gram-positive bacterium and is not typically associated with UTIs.
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