Question

Attached to the page is an excel file with a list of test results for 5 different enterics. Use this data to construct a Dichotomous key. You can hand draw or use PowerPoint (or similar) to create your dichotomous key. Attach your key to this page.

	Sucrose	MR	VP	Nitrate	H2S
Microbe
Citrobacter freundii	+	+	-	+	+
Klebsiella oxytoca	+	-	+	+	-
Providencia stuarti	+	+	-	+	-
Salmonella typhi	-	+	-	+	+
Shigella dysenteriae	-	+	-	+	-

Answer 1

Answer:

The Dichotomous key for the given 5 enterics is as given under. Some tests used more than once and some tests are not used as they do not help in identification.

Dichotomaus key Citrobacter fruendie Klebsiella oxytoca Providencia stuarti Salmonela Jyrki Shigella dysenterias Sucrose Setyphi Sto dysenterial Pasitive Cofruendie ki oxytoca P. suarti Negative MR Test Positive c. foruendii Negative Klebsiella Oxytoca H₂S Positive Salmonella tykki Negative Shigella dysenterial P. stuarti H₂S Positive Citrobacter Negative Providencia suarli fruendi