Concept explainers
(a)
To explain: The purpose of Crystal violet in the MacConkey agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
(b)
To explain: The purpose of blood in the blood agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
(c)
To explain: The purpose of eosin and methylene blue dyes in the eosin-methylene blue agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
(d)
To explain: The purpose of high salt concentration in the mannitol salt agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
(e)
To explain: The purpose of lactose in the MacConkey agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
(f)
To explain: The purpose of phenylethyl alcohol in the phenylethyl alcohol agar medium.
Introduction: The culture media may be complex, defined, supportive, enriched, selective, and differential. The culture media possess the same qualities that are needed by the microbes as if they grow in their natural habitat. The culture media can be modified according to the nutritional needs of the microbes.
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