Which changes proteins into ammonia ?

Options

A. Rhizobium
B. Nitrobacter
C. Azotobacteria
D. Bacteria of decay

Answer

To answer the question "Which changes proteins into ammonia?", we can break down the process into several key steps:

### Step-by-Step Solution:

1. **Understanding the Nitrogen Cycle**: The nitrogen cycle involves several processes that convert nitrogen from one form to another in the environment, including nitrogen fixation, nitrification, and decomposition.

2. **Role of Decomposers**: When plants and animals die or when they excrete waste, their proteins need to be broken down. This is where decomposers come into play. Decomposers are microorganisms, including bacteria, that break down organic matter.

3. **Decomposition Process**: During decomposition, proteins from dead organisms and waste products are broken down by bacteria. This process involves the conversion of complex organic molecules into simpler compounds.

4. **Formation of Ammonia**: As proteins are decomposed, one of the end products of this breakdown is ammonia (NH3). This is a crucial step because ammonia can then be utilized by plants again, thus continuing the nitrogen cycle.

5. **Identifying the Bacteria**: The specific bacteria responsible for converting proteins into ammonia during decomposition are often referred to as "bacteria of decay" or decomposer bacteria. They play a vital role in recycling nitrogen back into the soil.

6. **Conclusion**: Therefore, the bacteria that change proteins into ammonia are the decomposer bacteria, which are essential for the nitrogen cycle.

### Final Answer:
The bacteria of decay (decomposers) change proteins into ammonia.

---