Gram stain investigation

Gram stain investigation: copy your answers to the Gram stain investigation lab.

1. What were your results? Name the bacteria and appearance after staining.
2. Describe two ways the food(s) could have become contaminated.
3. Name two ways contamination could have been avoided.
4. Did you find any microorganism known not to cause food poisoning? What?
5. In what ways does Gram staining aide in the identification of unknown bacteria?
6. If you forgot to add the iodine, would the Gram-positive bacteria still be purple at the end of the staining procedure? Explain why or why not.