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Microbiology Media Composition Quiz

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Questions and Answers

What is the characteristic of a chemically defined medium?

It contains a mixture of proteins and extracts

Exact amount of pure chemicals is known (correct)

Supports the growth of a wide variety of microbes

It provides minimal and basic growth requirements

Which type of media inhibits the growth of some bacteria while selecting for the growth of others?

Media composed of a mixture of proteins and extracts

Selective media (correct)

Complex nutrient media

General purpose media

What is the primary difference between general purpose media and selective media?

Selective media supports the growth of a wide variety of microbes

Selective media inhibits the growth of some bacteria while selecting for the growth of others (correct)

General purpose media contains known amounts of pure chemicals

General purpose media inhibits the growth of some bacteria

Which type of media provides the minimal and basic growth requirements for bacteria but not all microbes can grow on it?

Chemically defined medium (C) Signup and view all the answers

What is the composition of a complex medium?

It contains a mixture of proteins and extracts (C) Signup and view all the answers

What makes Mannitol Salt Agar a selective medium?

It selects for salt tolerant bacteria (B) Signup and view all the answers

What is the role of phenol red in Mannitol Salt Agar?

It serves as a pH indicator (A) Signup and view all the answers

Why is MacConkey Agar considered a selective medium?

It contains bile salts and crystal violet that inhibit the growth of Gram-positive bacteria (D) Signup and view all the answers

What is the function of neutral red in MacConkey Agar?

It acts as a pH indicator (B) Signup and view all the answers

What is the differential ingredient in MacConkey Agar?

Lactose sugar (A) Signup and view all the answers