Micro Quiz Part 4

Eosin-methylene blue is known for identifying ENTOROBACTERALES which is

• Gram positive

• Gram negative

Causes dye to create a green metallic sheen in EMB

• Lactose fermenters

• Non lactose fermenters

In non-lactose fermenters in EMB BLANK the pH of the

agar, causing dyes to solubilize and result in

colorless colonies

• Raises

• Lowers

EMB is known as

• Selective, differential

• Selective, enrichment

• Selective

• Supportive, differential

contains bile salts and

dyes to slow the growth of most nonpathogenic

gram-negative bacilli found in GI trac

• Hektoen Enteric Agar

• PEA agar

• XLD agar

• Mayer-Thartin agar

Salmonella spp. and Shigella spp. don't ferment lactose in HE therefore they are

• blue/green

• pink/red

• Black in center

Nonenteric pathogens that grow on HE will have a change in PH and turn

• Blue/green

• orange

• Pink

• Red

Indicator of hydrogen sulfide (H2s) in HE

• Ferric ammonium citrate

• Ferrous ammonium citrate

• Sodium

• Bile salts

Produces hydrogen sulfide and can be seen as a black precipitate

• Shigella

• Salmonella

• Bacillus

• Chlymidia

HE is known as

• Selective

• Selective, differential

• Differential

• Supportive, enrichment