Nitrate reduction test can be used to differentiate between Pseudomonads and Enterobacteriaceae. You inoculated your Nitrate broth with your unknown; after incubation, you added 5 drops of reagent A and 5 drops of reagent B. You observe a red color within 2 minutes. Is this a + or a - reaction? Assuming you did not get a red color, you then added a pinch of Zinc and this time tou obtained a red color. What does this mean?

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Q: Lactose fermentation

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Modes of Nutrition

It is a biological process of providing or obtaining food that is necessary for growth and health. It includes many physiological processes - absorption, ingestion, assimilation, catabolism, excretion, etc. In biology, the science that deals with nutrition's physiological and chemical processes are called "nutritional science."