Gram negative cells appear in color due to a

2. Gram-Negative cells appear _______ in color due to a ______ peptidoglycan layer in the cell wall.
1. True or False: The distinguishing characteristic of Gram-Negative bacteria is the presence of LPS in the outer membrane. 2. True or False: If you wish to study the motility of an organism you cannot heat fix, but you can chemically fix the
specimen.

1. You want to observe the size and shape of a cell. What is the easiest staining technique that you could perform? Name at
least one dye you would use during this process.
2. You suspect a patient may have TB. Once a sample has been obtained it is sent off to the lab for an acid-fast stain. If the
patient were infected with TB, describe what you would expect to see on the stained slide.
3. True or False: If a patient is suspected of having malaria, a Giemsa stain would be an appropriate differential test to
perform.
1. True or False: Growth media is best suited for distinguishing between two similar species of bacteria.
2. A researcher is asked to determine which of two vials contains E coli and which contains Salmonella. Knowing both are
Gram-Negative while only one of them is capable of fermenting lactose, which type of media would be best suited:
3. What are the requirements of a fastidious microbe?
Enriched medias thus contain these specific and essential nutrients required for the growth of a particular subset
of microorganisms.