A 73 year old woman is admitted to hospital for treatment of an abscess from staph. It was necessary to disinfect the hospital room after her discharge. One thousand of S. aureus cells are exposed to disinfectant. After 10 minutes, 90% of the cells are killed. How many cells are viable after 20 minutes?

Microbiology question. Chose the right answer

__________ indicates ________________ in the cell culture.       Bovine Serum, trypsin       Yellow media, waste buildup       Orange media, contamination       Clear pink media, cell suspension

If you saw large, eukaryotic cells in the preparation made of your gumline, they were most likely your own eptihelial cells. Are you gram-postitive or Gram- negative?

Label heterocyst.

Protozoan cysts are resistant to many disinfection methods.   True False

Microbiology question. Chose the right answer

You counted 4, 6, 12, 3 cells in each of the 4.outed squares of a hemacytomeyer. What are the cells per milliliter in that culture? If you resuspended your cell pellet 2.5 mL, what is the total cell count? How many uL do you need to add to a new culture if you want 4250 cells?

Hand draw (with a pen/pencil) a picture of salmonella typhi organism. Label and describe the following cell structures and include a brief summary of their functions: nuclei/organelles flagella/cilia segments outer covering (cuticle, tegument) attachment structures (suckers, hooks, etc.) cysts/oocysts (if your pathogen makes them)

A 55-year-old woman with type 2 diabetes mellitus comes to the physician with a 2-day history of oozing, foul-smelling wound on her foot. Physical examination shows a 4-cm, necrotizing wound on the heel with purplish black discoloration of the skin around the wound, and crepitant bullae producing thin, serous fluid. A Gram stain of tissue biopsy from the site shows gram-positive rods. Which of the following toxins is produced by the most likely causal organism? Answers A-E A Alpha toxin B Endotoxin C D E Exfoliative toxin Exotoxin A Panton Valentine toxin O O 9: O