Mannitol salt agar is classified as a complex medium. Group of answer choices True False
Question
Mannitol salt agar is classified as a complex medium.
Group of answer choices
- True
- False
Solution
Answer
True.
Mannitol salt agar (MSA) is classified as a complex medium because it contains a variety of nutrient sources, including peptones, sodium chloride, mannitol, and phenol red. The peptones provide essential nutrients, while mannitol serves as a fermentable carbohydrate. The high concentration of sodium chloride makes MSA selective for salt-loving bacteria (halophiles), while phenol red acts as a pH indicator to differentiate between mannitol fermenters and non-fermenters. Thus, MSA supports the growth of certain bacteria while inhibiting others, characterizing it as a complex medium.
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