Reference no: EM133330424

Question 1. What are the 3 domains of the Three Domain System proposed by Woese in the 1970? What type of molecular and other cell biology data is this system based on?

Question 2. What is the difference between the cell wall of gram-negative and gram-positive bacteria? After the gram stain procedure, why do gram-positive bacteria appear purple, while gram- negative bacteria appear pink/red in color? Why are gram-negative bacteria typically more resistant to antibiotic drugs than gram-positive bacteria?

Question 3. Describe the shape of the causative agent of Cholera (Vibrio cholera). How does it move? Is it gram-negative or gram-positive? How is Cholera transmitted to humans? What are the symptoms of Cholera?

Question 4. Name the Shiga-toxin producing pathogenic serotype of E. coli that can cause severe hemorrhagic (bloody) diarrhea. Describe its shape. Is it gram-negative or gram-positive? How is it typically transmitted to humans?

Question 5. Name two important pathogens of humans that are found among the spiral (spirilla and spirochete) forms. Are they gram-negative or gram-positive? How do they move?

Question 6. What is the scientific name (genus and species name) of the spherically-shaped pathogenic bacterium that commonly causes pneumonia? What is the typical arrangement of this strair it gram-negative or gram positive? What are the symptoms of pneumonia? How is it
transmitted?