Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:**Interpreting a Catalase Test:**
A catalase test is a diagnostic tool used in microbiology to detect the presence of the enzyme catalase in bacterial cells. This enzyme decomposes hydrogen peroxide into oxygen and water, which can be visualized by the production of bubbles.
**Image Explanation:**
- The image associated with this test shows a sample on a slide, and a bubble formation can be observed.
- This bubble formation indicates the liberation of oxygen gas.
**Interpretation:**
- **Positive Catalase Test:** The presence of bubbles in the sample (as seen in the image) indicates a positive catalase test. This means the bacterium being tested produces the enzyme catalase.
- **Negative Catalase Test:** If no bubbles were present, the test would be negative, indicating that catalase is not produced by the bacterium.
**Conclusion:**
The sample shown in the image demonstrates a positive catalase test due to the observed bubbles. This suggests that the bacterium present in the sample is capable of producing catalase, an important characteristic used to identify various types of bacteria.
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