Microbiology An Introduction 12th Edition Test Bank

Questions 80

ATI RN

ATI RN Test Bank

Microbiology An Introduction 12th Edition Test Bank Questions

Question 1 of 5

At a bacteriological laboratory animal skins are analyzed by means of Ascoli precipitaion test. What is detected if the reaction is positive?

Correct Answer: A

Rationale: The Ascoli precipitation test is specifically used to detect anthrax agent antigens. The test involves mixing a patient's serum with a solution containing anthrax antigens, leading to precipitation if the antigens are present. Therefore, a positive reaction in this test indicates the presence of anthrax agent antigens. The other choices (B: Brucellosis agent, C: Anaerobic infection toxin, D: Plague agent) are incorrect because the Ascoli precipitation test is not designed to detect these specific agents or toxins.

Question 2 of 5

The optochin sensitivity test demonstrates:

Correct Answer: B

Rationale: The optochin sensitivity test is used to differentiate Pneumococcal (Streptococcus pneumoniae) from other streptococci. Optochin sensitivity is a characteristic feature of Pneumococcal, as it inhibits its growth. The test involves placing optochin discs on a culture plate and observing the zone of inhibition around the disc for Pneumococcal. Neisseria gonorrhoeae, Staphylococci, and Group A streptococci do not exhibit optochin sensitivity, making them incorrect choices. In summary, the optochin sensitivity test is specific to Pneumococcal, making choice B the correct answer.

Question 3 of 5

Sanitary control is applied to monitor the quality of:

Correct Answer: A

Rationale: The correct answer is A because sanitary control is crucial for monitoring the quality of a wide range of essential services to ensure public health and safety. Food safety, drinking water quality, cleanliness in restaurants, hygiene in healthcare settings, and transportation systems all fall under the purview of sanitary control. Therefore, option A is the most comprehensive and accurate choice. Option B is incorrect because it does not include monitoring restaurants, health care services, and transport, which are important aspects of sanitary control. Option C is incorrect as it excludes transportation, an essential area that requires sanitary monitoring. Option D is incorrect as it does not cover health care services, which are critical for ensuring public health and safety.

Question 4 of 5

A child with fever and swollen lymph nodes had a Gram-stained smear revealing Gram-negative rods with a safety pin appearance. What is the causative agent?

Correct Answer: A

Rationale: The correct answer is A: Yersinia pestis. This bacterium causes the plague, which presents with fever and swollen lymph nodes. The safety pin appearance on Gram stain is characteristic of Yersinia pestis. B: Francisella tularensis causes tularemia, which presents differently and does not show safety pin appearance on Gram stain. C: Brucella abortus causes brucellosis, which does not typically present with the same symptoms as described in the question. D: Clostridium botulinum causes botulism, which does not show safety pin appearance on Gram stain and does not typically present with fever and swollen lymph nodes.

Question 5 of 5

The causative agent of typhoid fever is:

Correct Answer: C

Rationale: The correct answer is C: Salmonella typhi. Typhoid fever is caused by the bacterium Salmonella typhi, specifically transmitted through contaminated food and water. Shigella dysenteriae causes bacillary dysentery, Vibrio cholerae causes cholera, and Escherichia coli can cause various gastrointestinal illnesses, but not typhoid fever. Identifying the causative agent is crucial for effective treatment and prevention strategies.

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