Lab 7: Enterobacteriaceae and Gram-negative Bacteria
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Questions and Answers

Most strains of E. coli ferment ______ rapidly

lactose

E. coli produce ______

indole

E. coli are ______

motile

E. coli colonies on MacConkey agar appear ______

<p>pink</p> Signup and view all the answers

Escherichia coli is a member of the family Enterobacteriaceae, which are commonly referred to as ______ rods

<p>Gram-negative</p> Signup and view all the answers

Escherichia coli, along with Shigella, Salmonella, Klebsiella, and Yersinia are considered the most virulent for humans, also known as ______

<p>true pathogens</p> Signup and view all the answers

Escherichia coli, like other members of the Enterobacteriaceae family, are ______ anaerobes

<p>facultative</p> Signup and view all the answers

Escherichia coli, along with other Enterobacteriaceae, are ______ negative

<p>oxidase</p> Signup and view all the answers

Shigella species are closely related to E coli But, non-lactose fermenter.Shigella dysenteriae under the microscope Shigella do not ferment ______ or produce hydrogen sulfide gas, so the resulting colonies will be colorless.

<p>lactose</p> Signup and view all the answers

Shigella on SS agar Salmonella on SS agar with Black ______

<p>colonies</p> Signup and view all the answers

Proteus mirabilis, the most commonly isolated member of the group, P mirabilis and Proteus vulgaris share the ability to ______ over the surface of media, rather than remaining confined to discrete colonies.

<p>swarm</p> Signup and view all the answers

Salmonella-Shigella (SS) Agar: Used for selective recovery of Salmonella from stool culture Salmonellae usually produce ______ non-fermenting colonies with black centers.

<p>lactose</p> Signup and view all the answers

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