differential and selective media

Mannitol salt agar is selective for ___.

• Gram positive bacteria

• Gram negative bacteria

• growth in the presence of bile

• salt tolerance

Choose the letter form the image that represents alpha hemolysis.

• B

• A

• C

• A and B

This type of media inhibits the growth of organisms other than the one being grown. Can be complex or chemically defined media.

• selective media

• diferential media

• chemically defined media

• enrichment culture media

This type of media contains specific ingredients that help us to visually distinguish which species do or do not carry out a specific biochemical process.

• selective media

• differential media

• chemically defined media

• enrichment culture media

T/F: media can be both selective and differential.

• True

• False

This media selects for gram-negative organisms and isolates lactose fermenters (pink) and non-lactose fermenters (clear).

• choclate agar

• Mannitol salt agar

• Eosin-methylene blue (EMB) agar

• MacConkey agar

This is a general purpose medium that supports the growth of a wide variety of bacteria.

• blood agar

• trypticase soy agar

• chocolate agar

• MacConkey agar

Plays a major role in making a medium differential; it detects acid or base production, depending on the medium.

• pH indicator

• Bile salts (oxgall)

• Lactose

• Thiosulfate

• Ferric ion

The type of culture media that can turn bacteria different colors on a petri dish is called a ____ media

• selective

• natural

• differential

• broth

Blood agar reveals ...

• bacterial cell wall structure

• if bacteria has a slime layer

• if bacteria lyses blood cells

• if bacteria are selective