Foundations in Microbiology Test Bank

Foundations in Microbiology Test Bank Related

Review Foundations in Microbiology Test Bank related questions and content

Patients with similar complaints applied to the doctor: weakness, pain in the intestines, disorder of GIT. Examination of the feces revealed that one patient with four nucleus cysts should be hospitalized immediately. For what protozoa are such cysts typical?

  • A. Lamblia
  • B. Dysenteric amoeba
  • C. Balantidium
  • D. Trichomonas
Correct Answer: B

Rationale: The correct answer is B: Dysenteric amoeba.
1. Dysenteric amoeba causes amoebiasis, which presents with symptoms like weakness, intestinal pain, and gastrointestinal disorders.
2. The presence of four-nucleus cysts in the feces indicates an infection with Entamoeba histolytica, the causative agent of amoebiasis.
3. Multiple-nucleus cysts are characteristic of Entamoeba histolytica, distinguishing it from other protozoa.
4. Lamblia (choice A), Balantidium (choice C), and Trichomonas (choice D) are not associated with four-nucleus cysts or the mentioned symptoms, making them incorrect choices.

You may also like to solve these questions

After the transfer of the F plasmid from the donor to the recipient cell..

  • A. It is not possible to predict the outcome
  • B. The donor cells become F
  • C. The two cells become F
  • D. The two cells become F+
Correct Answer: D

Rationale: After the transfer of the F plasmid from the donor to the recipient cell, the correct answer is D. This is because the F plasmid carries genes for conjugation, allowing the recipient cell to become F+ (containing the F plasmid). The donor cell remains F. Choice A is incorrect as the outcome can be predicted based on the transfer of the F plasmid. Choice B is incorrect because the donor cell does not become F after transferring the F plasmid. Choice C is incorrect as only the recipient cell becomes F+, not both cells.

A patient was taken to a hospital with acute food poisoning caused by homemade canned mushrooms. The product analysis revealed some microorganisms that develop only in the absence of oxygen. What microorganisms caused the poisoning?

  • A. Obligate anaerobes
  • B. Facultative anaerobes
  • C. Microaerophiles
  • D. Obligate aerobes
Correct Answer: A

Rationale: The correct answer is A: Obligate anaerobes. These microorganisms thrive in the absence of oxygen, as seen in the canned mushrooms where oxygen is limited. They produce toxins causing food poisoning. Facultative anaerobes (B) can survive with or without oxygen. Microaerophiles (C) require low levels of oxygen. Obligate aerobes (D) need oxygen to survive and would not be responsible for the poisoning in this case.

The causative agent of plague is:

  • A. Bordetella pertussis
  • B. Yersinia pestis
  • C. Rickettsia prowazekii
  • D. Treponema pallidum
Correct Answer: B

Rationale: The correct answer is B: Yersinia pestis. Y. pestis is the causative agent of plague, a serious infectious disease transmitted through fleas. It causes bubonic, pneumonic, and septicemic plague. Bordetella pertussis causes whooping cough, Rickettsia prowazekii causes epidemic typhus, and Treponema pallidum causes syphilis. Y. pestis is the correct answer because it is specifically associated with plague, making the other options incorrect.

Which strain E. coli can cause bloody diarrhea in children similar to shigellosis

  • A. ETEC
  • B. EIEC
  • C. EAEC
  • D. EPEC
Correct Answer: B

Rationale: The correct answer is B: EIEC. This strain of E. coli can cause bloody diarrhea in children similar to shigellosis due to its ability to invade and replicate within the intestinal epithelial cells, leading to inflammation and bloody stools. ETEC (A) causes watery diarrhea due to enterotoxins. EAEC (C) causes persistent diarrhea. EPEC (D) causes attaching and effacing lesions on the intestinal mucosa without invasion.

The phagocytosis is:

  • A. Killing of bacterial cells with bactericidal antibiotics
  • B. Blocking of key bacterial enzymes
  • C. Active engulf and destruction of microorganisms by some host cells
  • D. There is no correct answer
Correct Answer: C

Rationale: The correct answer is C because phagocytosis refers to the process where certain host cells engulf and destroy microorganisms. This is an essential mechanism of the immune system to eliminate pathogens. Choice A is incorrect because phagocytosis does not involve the use of antibiotics. Choice B is incorrect as it describes a different mechanism of action against bacteria. Choice D is incorrect because phagocytosis is a well-established biological process.

Copyright © 2025 Nokea. All rights reserved.