D311 WGU Microbiology Specific Study Questions And
Answers
What is the difference between pathogenesis and virulence? Right Ans -
Pathogenesis refers to the ability to cause disease, while virulence refers to
the severity of the disease.
What is antigenic drift? Right Ans - A small mutation in the spike protein,
causing slight changes.
Which type of pathogen uses antigenic variation as a strategy to evade the
immune system? Right Ans - Bacteria, viruses, and fungi to alter their
surface proteins and escape recognition by the immune system
Which of the following is an example of a bacterial virulence factor? Right
Ans - Type IV pili
Which of the following toxins is heat-stable? Right Ans - Endotoxins
Which of the following toxins is heat-labile? Right Ans - Exotoxins
Which bacterial class is more resistant to antibiotics? Right Ans - Gram-
negative bacteria have a thinner peptidoglycan layer and are surrounded by
an outer membrane, making them more resistant to antibiotics
What does the primary stain carbolfuchsin bind to in acid-fast bacteria?
Right Ans - Binds to mycolic acids in the cell walls of acid-fast bacteria like
Mycobacterium
What color do endospores remain after staining with the Schaeffer-Fulton
method? Right Ans - green while the rest of the cell is stained pink by
safranin
Which of the following best describes bacterial DNA? Right Ans - Bacterial
DNA is circular and not housed in a nucleus
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