What type of medium is MacConkey agar?, Enriched only, Selective and differential, Differential only, Simple medium, Which component inhibits Gram-positive bacteria?, Lactose, Agar, Bile salts and crystal violet, Peptone, What color do lactose-fermenting bacteria appear?, Colorless, Green, Pink or red, Blue, Which of the following is a lactose fermenter?, Salmonella, Shigella, Escherichia coli, All of the above, What is the function of neutral red in MacConkey agar?, Nutrient source, Solidifying agent, pH indicator, Inhibitor

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