Which organism is identified by a test for esculin hydrolysis in the presence of bile?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Study for your Microbiology exam with engaging quizzes and comprehensive questions. Review essential concepts in Clinical Laboratory Science to ensure your success. Get ready for your exam!

Multiple Choice

Which organism is identified by a test for esculin hydrolysis in the presence of bile?

Explanation:
In this test, the key idea is that some Gram-positive cocci can grow in bile and break down esculin. When esculin is hydrolyzed in the presence of bile, esculetin reacts with ferric ions in the medium to form a dark, almost black color. Enterococcus species are notable for their ability to tolerate bile and hydrolyze esculin, so they produce this dark coloration and are identified by a positive result. The other organisms listed generally do not both grow in bile and hydrolyze esculin, so they do not produce the dark reaction. This combination of bile tolerance and esculin hydrolysis specifically points to Enterococcus.

In this test, the key idea is that some Gram-positive cocci can grow in bile and break down esculin. When esculin is hydrolyzed in the presence of bile, esculetin reacts with ferric ions in the medium to form a dark, almost black color. Enterococcus species are notable for their ability to tolerate bile and hydrolyze esculin, so they produce this dark coloration and are identified by a positive result. The other organisms listed generally do not both grow in bile and hydrolyze esculin, so they do not produce the dark reaction. This combination of bile tolerance and esculin hydrolysis specifically points to Enterococcus.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy