1. Phenylethyl alcohol (PEA) agar is a selective media. Which of the following organisms should NOT grow well on PEA agar? Choose all that apply. Klebsiella pneumoniae Staphylococcus aureus Escherichia coli Streptococcus pneumoniae Bacillus cereus 2. Phenol red, a pH indicator, is a component of some differential media. Phenol red is a red at neutral and basic pHs and turns yellow at acidic pHs. Which of the following conditions would result in a yellow color in a medium containing lactose and phenol red? A.Growth of an organism that ferments glucose to alcohol. B. Growth of an organism that ferments mannitol but not lactose. C. Growth of an organism that ferments lactose to lactic acid. D. Growth of an organism that is not capable of fermenting any sugars.
1. Phenylethyl alcohol (PEA) agar is a selective media. Which of the following organisms should NOT grow well on PEA agar? Choose all that apply.
Klebsiella pneumoniae
Staphylococcus aureus
Escherichia coli
Streptococcus pneumoniae
Bacillus cereus
2.
Phenol red, a pH indicator, is a component of some differential media. Phenol red is a red at neutral and basic pHs and turns yellow at acidic pHs. Which of the following conditions would result in a yellow color in a medium containing lactose and phenol red?
A.Growth of an organism that ferments glucose to alcohol.
B. Growth of an organism that ferments mannitol but not lactose.
C. Growth of an organism that ferments lactose to lactic acid.
D. Growth of an organism that is not capable of fermenting any sugars.
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