9.6 Media Used for Bacterial Growth

What is an example of an all-purpose medium?

• Mannitol salt agar

• Tryptic soy broth (TSB)

• MacConkey agar

• Mueller-Hinton agar

Which type of media contains growth factors, vitamins, and other essential nutrients?

• Selective media

• Enriched media

• Complex media

• Differential media

What is the characteristic of a chemically defined medium?

• Supports the growth of all microorganisms

• Contains extracts and digests of yeasts, meat, or plants

• Inhibits the growth of unwanted microorganisms

• The complete chemical composition is known

Which medium is often used to test antibiotics?

• Nutrient broth

• Mueller-Hinton agar

• Mannitol salt agar

• MacConkey agar

What is the purpose of selective media?

• To support the growth of all microorganisms

• To distinguish colonies of different bacteria

• To inhibit the growth of unwanted microorganisms

• To provide a complete chemical composition

Which medium is used to favor the growth of gram-negative bacteria?

• Tryptic soy broth

• Mueller-Hinton agar

• Nutrient broth

• MacConkey agar

What is the role of differential media?

• To make it easy to distinguish colonies of different bacteria

• To provide a complete chemical composition

• To support the growth of all microorganisms

• To inhibit the growth of unwanted microorganisms

What color do lactose fermenters turn on MacConkey agar?

• Hot pink

• Blue

• Yellow

• Green

What is the pH indicator used in MacConkey agar?

• Phenol red

• Neutral red

• Bromothymol blue

• Methyl red

What is the pH indicator in mannitol salt agar?

• Bromothymol blue

• Phenol red

• Neutral red

• Methyl red