What modification is made to MacConkey agar when used for Mycobacterium identification?

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Multiple Choice

What modification is made to MacConkey agar when used for Mycobacterium identification?

Explanation:
MacConkey agar is designed to suppress Gram-positive bacteria using bile salts and crystal violet, while allowing many Gram-negative bacteria to grow and differentiating lactose fermenters. Some Mycobacterium species are inhibited by crystal violet, so removing that dye from the medium lets these organisms grow more readily on a MacConkey-type medium. The other components, like lactose, are not the modification needed for identifying Mycobacterium, so the key change is omitting crystal violet.

MacConkey agar is designed to suppress Gram-positive bacteria using bile salts and crystal violet, while allowing many Gram-negative bacteria to grow and differentiating lactose fermenters. Some Mycobacterium species are inhibited by crystal violet, so removing that dye from the medium lets these organisms grow more readily on a MacConkey-type medium. The other components, like lactose, are not the modification needed for identifying Mycobacterium, so the key change is omitting crystal violet.

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