Which organism matches the profile NLF; H2S; Indole negative; PAD positive; Urease positive?

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Multiple Choice

Which organism matches the profile NLF; H2S; Indole negative; PAD positive; Urease positive?

Proteus mirabilis fits this profile because it is a non-lactose fermenter that produces hydrogen sulfide, and it shows indole negativity, phenylalanine deaminase (PAD) positivity, and urease positivity. These combined traits are characteristic for Proteus and help distinguish it from other non-lactose fermenters. For example, Proteus vulgaris (a close relative) is indole positive, so the indole negative result helps narrow to mirabilis. The PAD and urease activities reinforce the identification, as Proteus species commonly exhibit both, along with H2S production. Other organisms in the options typically lack this exact combination of H2S production, PAD positivity, and strong urease activity, making Proteus mirabilis the best match.

Proteus mirabilis fits this profile because it is a non-lactose fermenter that produces hydrogen sulfide, and it shows indole negativity, phenylalanine deaminase (PAD) positivity, and urease positivity. These combined traits are characteristic for Proteus and help distinguish it from other non-lactose fermenters. For example, Proteus vulgaris (a close relative) is indole positive, so the indole negative result helps narrow to mirabilis. The PAD and urease activities reinforce the identification, as Proteus species commonly exhibit both, along with H2S production. Other organisms in the options typically lack this exact combination of H2S production, PAD positivity, and strong urease activity, making Proteus mirabilis the best match.

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