Bacteria Dichotomous Key
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Bacteria Dichotomous Key

Gram

reaction?

Glucose

fermantation?

Morphology

Motile at

37C

Plesiomonas

shigelloides

Staphylococcus

aureus

Erysippelothrix

rhusiopathiae

-

+

Acid

Acid & gas

Rods

Cocci

Urea

hydrolyzed

Aeromonas

hydrophila

No

Yes

Indole

produced?

Citrate

utilized?

No

Yes

Indole

produced?

Indole

produced?

Indole

produced?

Indole

produced?

No

Yes

No

Yes

Bacteria Dichotomous Key Template

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publish time: 2021-02-26
Lisa Anderson

In this dichotomous example, Begin the process of identifying unknown bacteria by observing their physical characteristics, such as cell wall, shape and linkages. Use standard laboratory procedures, like cell staining, culturing and DNA sequencing to further narrow down your identification. Bacteria are generally grouped into species according to their physical and metabolic characteristics, rather than their genetic relationships to one another.