Which test confirms the presence of urease in Proteus species?

Which test confirms the presence of urease in Proteus species?

• A. Triple sugar iron (TSI) test
• B. Urease test, which turns the medium pink if urease is produced
• C. Citrate utilization test
• D. Indole test

Answer: (B)

The urease test is specifically designed to confirm the presence of urease, an enzyme produced by certain bacteria, including Proteus species. When urease is present, it hydrolyzes urea into ammonia and carbon dioxide, leading to an increase in pH. This change in pH causes the indicator in the medium to turn pink, providing a clear visual confirmation of urease activity. In contrast, the other tests serve different purposes. The triple sugar iron (TSI) test assesses sugar fermentation and hydrogen sulfide production but does not directly measure urease activity. The citrate utilization test evaluates an organism's ability to use citrate as its sole carbon source but again does not assess urease production. The indole test measures the ability to convert tryptophan into indole, which is unrelated to urease activity. Thus, the urease test is the definitive method for detecting urease in Proteus species, making it the correct choice for this question.

The urease test is specifically designed to confirm the presence of urease, an enzyme produced by certain bacteria, including Proteus species. When urease is present, it hydrolyzes urea into ammonia and carbon dioxide, leading to an increase in pH. This change in pH causes the indicator in the medium to turn pink, providing a clear visual confirmation of urease activity.

In contrast, the other tests serve different purposes. The triple sugar iron (TSI) test assesses sugar fermentation and hydrogen sulfide production but does not directly measure urease activity. The citrate utilization test evaluates an organism's ability to use citrate as its sole carbon source but again does not assess urease production. The indole test measures the ability to convert tryptophan into indole, which is unrelated to urease activity.

Thus, the urease test is the definitive method for detecting urease in Proteus species, making it the correct choice for this question.