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Special Purpose Media for Microorganism Growth

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Questions and Answers

What is the purpose of adding blood and other special nutrients to the general media in enriched media?

To inhibit the growth of all microorganisms
To encourage the growth of fastidious heterotrophs (correct)
To promote the growth of anaerobic bacteria
To create a suitable environment for fungi growth

What gives blood agar its opaque red color when solidified?

Growth of specific fungi
Presence of hemoglobin from blood (correct)
Toxins released by certain bacteria
Addition of a red dye

Why is chocolate agar considered suitable for the growth of Neisseria?

It contains a chocolate flavoring that Neisseria prefer
It provides an environment with high oxygen content
The medium is heated after preparation (correct)
The heat treatment enhances Neisseria growth

Which type of bacteria can be identified by their hemolytic action on the red cells in blood agar?

Staphylococcus aureus (C) Signup and view all the answers

What distinguishes selective media from general media in promoting microbial growth?

Selective media favor the growth of specific groups and suppress others (D) Signup and view all the answers

What is the primary purpose of selective media?

To inhibit the growth of certain microorganisms (A) Signup and view all the answers

Which medium is used for the cultivation of tuberculosis bacilli?

Lowenstein Jensen medium (B) Signup and view all the answers

What is the purpose of the bile salts in MacConkey agar?

To inhibit the growth of non-intestinal bacteria (D) Signup and view all the answers

Which medium is used to isolate gram-positive bacteria?

Phenylethyl alcohol agar (PEA) (C) Signup and view all the answers

What is the purpose of the neutral red indicator in MacConkey agar?

To change color in the presence of acid produced by lactose fermentation (D) Signup and view all the answers

What is the primary purpose of mannitol salt agar (MSA)?

To isolate staphylococci from clinical and non-clinical samples (C) Signup and view all the answers

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