Which organism produces a positive phenylalanine deaminase reaction?

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Multiple Choice

Which organism produces a positive phenylalanine deaminase reaction?

Explanation:
Phenylalanine deaminase activity identifies bacteria that can remove the amino group from phenylalanine to form phenylpyruvic acid, which, when ferric chloride is added, gives a green color if present. Among common Enterobacteriaceae, PAD activity is found in the Proteae group, including Providencia species. Providencia stuartii readily produces phenylalanine deaminase, so the test yields a positive (green) result. The other listed organisms typically lack this enzyme, so they do not develop the green color and show a negative reaction.

Phenylalanine deaminase activity identifies bacteria that can remove the amino group from phenylalanine to form phenylpyruvic acid, which, when ferric chloride is added, gives a green color if present. Among common Enterobacteriaceae, PAD activity is found in the Proteae group, including Providencia species. Providencia stuartii readily produces phenylalanine deaminase, so the test yields a positive (green) result. The other listed organisms typically lack this enzyme, so they do not develop the green color and show a negative reaction.

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