2. Which of the following would the MSA medium NOT be considered: Select one: a.

Question

2. Which of the following would the MSA medium NOT be considered: Select one:

a. Complex medium

b. Chemically defined medium

c. Differential medium

d. Selective medium

3. If you took a swab from a patient and cultured it on a MSA plate, which of the following could be identified by just using this test? Select one:

a. Staphylococcus epidermidis

b. Escherichia coli

c. Staphylococcus aureus

d. Micrococcus luteus

4. If you streaked the 3 organisms in this lab on a PEA plate and after incubating for 2 days at 37 degrees Celcius nothing grew (but they did grow on a NA plate made at the same time and grown in the same conditions), which of the following is the most likely cause for this result? Select one:

a. The agar was toxic.

b. The beef extract was bad.

c. The temperature was too low.

d. Too much phenylethyl alcohol was used

. e. The temperature was too high.

5. Why is the NA plate inoculated in addition to the Columbia CNA with 5% sheep blood agar plate? Select one:

a. Used to compare growth on non-selective medium

b. Used as second selective medium

c. Used to promote hemolysis

d. Used because it is easier to see

e. Used as a practice plate

Explanation / Answer

2) A is correct answer that it can not be considered as complex media.

Complex media has many components in it whose exact composition is not known. And it allows the growth of most of the heterotrophic bacteria.

B is correct because chemically defined media allows the growth of certain type of bacteria and in this case MSA allow gram positive and Mannitol fermenting bacteria staphylococci.

C is correct because it contains Mannitol that makes it differential only for Mannitol fermenting bacteria.

D is correct because it is selective of gram positive bacteria because if it's high salt concentration that only gram positive can tolerate.

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