Can E.coli and E. aerogenes be differentiated morphologically? With the knowledg
ID: 84997 • Letter: C
Question
Can E.coli and E. aerogenes be differentiated morphologically? With the knowledge of how pregnancy tests work, describe how a pregnancy test manufacturer could create such ultra sensitive test. Why are people with diabetes are at higher risk of candidiasis infections. What mechanism does Trypanosoma use to evade and exhaust our immune system? What two types of infections are caused by dermatophyte fungi? What is the role of moisture and formites in their transmission?Can E.coli and E. aerogenes be differentiated morphologically? With the knowledge of how pregnancy tests work, describe how a pregnancy test manufacturer could create such ultra sensitive test. Why are people with diabetes are at higher risk of candidiasis infections. What mechanism does Trypanosoma use to evade and exhaust our immune system? What two types of infections are caused by dermatophyte fungi? What is the role of moisture and formites in their transmission?
With the knowledge of how pregnancy tests work, describe how a pregnancy test manufacturer could create such ultra sensitive test. Why are people with diabetes are at higher risk of candidiasis infections. What mechanism does Trypanosoma use to evade and exhaust our immune system? What two types of infections are caused by dermatophyte fungi? What is the role of moisture and formites in their transmission?
Explanation / Answer
Answer:
1. E.coli and E. aerogenes are identical in many superficial ways. They both produce white colonies at 37 degrees Celsius on nutrient agar. They both ferment lactose producing acid and gas. They are both Gram negative and virtually identical microscopically.
To distinguish them we must resort to biochemical tests. They metabolize sugars and other organic compounds, like Citrate, differently.
E. coli and Enterobacter aerogenes grow on the surface of Eosin-Methylene Blue Agar. There is glucose in this medium which both bacteria metabolize, but they both produce different byproducts.
E. coli produces a byproduct of glucose metabolism which reacts with the basic dyes in the medium producing a "green metallic sheen" in reflected light. Enterobacter produces normal colonies. The EMB test differentiates between E. coli and E. aerogenes sharply.
(Since there are more than 1 question, the first question have been answered according to the rules of Chegg)
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