Which organism shows lecithinase activity on egg yolk agar?

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Multiple Choice

Which organism shows lecithinase activity on egg yolk agar?

Egg yolk agar detects lecithinase activity, an enzyme that hydrolyzes Lecithin in the egg yolk to produce a zone of hydrolysis around growing colonies. The alpha toxin of Clostridium perfringens is a potent lecithinase, so its colonies on egg yolk agar typically show this clear hydrolysis zone. Among the listed organisms, only Clostridium perfringens produces lecithinase detectable this way, while the others do not. Therefore, the organism showing lecithinase activity on egg yolk agar is Clostridium perfringens.

Egg yolk agar detects lecithinase activity, an enzyme that hydrolyzes Lecithin in the egg yolk to produce a zone of hydrolysis around growing colonies. The alpha toxin of Clostridium perfringens is a potent lecithinase, so its colonies on egg yolk agar typically show this clear hydrolysis zone. Among the listed organisms, only Clostridium perfringens produces lecithinase detectable this way, while the others do not. Therefore, the organism showing lecithinase activity on egg yolk agar is Clostridium perfringens.

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