Free Microbiology Test Bank Questions PDF

Free Microbiology Test Bank Questions PDF Related

Review Free Microbiology Test Bank Questions PDF related questions and content

A patient complained about a carbuncle on his face. Examination results: neither dense nor painful edema of subcutaneous cellular tissue, there is black crust in the middle of the carbuncle and peripheral vesicular rash around it. Bacteriological examination revealed presence of immobile streptobacilli able of capsulation. What microorganisms are causative agents of this disease?

  • A. Bacillus antracis
  • B. Staptylococcus aureus
  • C. Bacillus anthracoides
  • D. Bacillus megaterium
Correct Answer: C

Rationale: The correct answer is C: Bacillus anthracoides.
1. The patient's symptoms align with cutaneous anthrax, caused by Bacillus anthracis.
2. Presence of immobile streptobacilli able of capsulation matches the characteristics of Bacillus anthracis.
3. Symptoms such as black crust, peripheral vesicular rash, and non-painful edema are classic for cutaneous anthrax.
4. Choice A: Bacillus antracis is a misspelling, not a valid option.
5. Choice B: Staphylococcus aureus does not match the symptoms described in the scenario.
6. Choice D: Bacillus megaterium is not associated with cutaneous anthrax.

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Which of the following bacteria is known for causing the disease known as whooping cough?

  • A. Bordetella pertussis
  • B. Clostridium tetani
  • C. Haemophilus influenzae
  • D. Staphylococcus aureus
Correct Answer: A

Rationale: The correct answer is A: Bordetella pertussis. This bacterium is known for causing whooping cough due to its ability to produce toxins that damage the respiratory tract, leading to severe coughing fits. Clostridium tetani causes tetanus, Haemophilus influenzae can cause respiratory infections but not whooping cough, and Staphylococcus aureus is more commonly associated with skin infections. Therefore, A is the correct choice based on its specific association with the disease in question.

Congenital CMV infections are caused by:

  • A. coronavirus
  • B. herpes simplex virus
  • C. cytomegalovirus
  • D. Epstein-Barr virus
Correct Answer: C

Rationale: The correct answer is C: cytomegalovirus (CMV). Congenital CMV infections are caused by the transmission of CMV from a pregnant woman to her fetus. CMV is a type of herpes virus, not a coronavirus (A), herpes simplex virus (B), or Epstein-Barr virus (D). CMV is known to cause serious health issues in newborns, making it crucial to identify and manage during pregnancy.

Which of the following have a fecal oral route of transmission?

  • A. Diphtheria
  • B. Typhoid fever
  • C. Syphilis
  • D. Spotted fever
Correct Answer: B

Rationale: The correct answer is B: Typhoid fever. Typhoid fever is transmitted through the fecal-oral route, meaning the bacteria from an infected person's feces can contaminate food or water and then be ingested by another person. This can lead to infection and illness. The other choices, diphtheria (A), syphilis (C), and spotted fever (D) are not transmitted through the fecal-oral route. Diphtheria is spread through respiratory droplets, syphilis is primarily sexually transmitted, and spotted fever is transmitted through tick bites. Thus, only Typhoid fever aligns with the fecal-oral route of transmission.

Which type of RNA carries the genetic code for protein synthesis?

  • A. mRNA
  • B. tRNA
  • C. rRNA
  • D. snRNA
Correct Answer: A

Rationale: The correct answer is A: mRNA. mRNA carries the genetic code from the DNA in the cell nucleus to the ribosomes in the cytoplasm, where protein synthesis occurs. It serves as a template for protein synthesis by specifying the order of amino acids. tRNA (choice B) brings amino acids to the ribosome during protein synthesis. rRNA (choice C) is a structural component of ribosomes. snRNA (choice D) is involved in RNA processing and splicing, not protein synthesis. Therefore, choice A is correct as it directly carries the genetic code for protein synthesis.

The correct hierarchical order for virus classification is

  • A. order, genus, family, subfamily, species.
  • B. species, genus, family, subfamily, order.
  • C. order, family, subfamily, genus, species.
  • D. genus, order, family, subfamily, species.
Correct Answer: C

Rationale: The correct hierarchical order for virus classification is order, family, subfamily, genus, species. This is because classification starts at a broader level (order) and narrows down to a more specific level (species). Order comes first to group viruses based on common characteristics, followed by family, which further categorizes them. Subfamily refines the classification, then genus groups similar viruses together, and species distinguishes different strains within a genus. Choice A is incorrect because it places genus before family, which is not the correct sequence. Choice B is incorrect as it starts with species, which is the most specific level. Choice D is incorrect because it places genus at the beginning, which is too specific for the hierarchical order.

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