Which of the following is manufactured from the molecular nitrogen by bacteria

Options

A. `NO_(3)`
B. `NO_(2)`
C. Amino acids
D. Ammonia

Answer

To solve the question "Which of the following is manufactured from the molecular nitrogen by bacteria?", we will follow these steps:

### Step 1: Understand the Nitrogen Cycle
The nitrogen cycle is a biogeochemical cycle that describes the transformations of nitrogen and nitrogen-containing compounds in nature. It involves various processes, including nitrogen fixation, nitrification, and denitrification.

### Step 2: Identify Nitrogen Fixation
Nitrogen fixation is the process by which molecular nitrogen (N₂) from the atmosphere is converted into ammonia (NH₃) or related compounds by certain bacteria. This process is crucial because most organisms cannot utilize atmospheric nitrogen directly.

### Step 3: Recognize the Role of Bacteria
Certain bacteria, such as Rhizobium, are capable of fixing nitrogen. They convert molecular nitrogen into forms that plants can use, such as nitrates (NO₃⁻) and ammonium (NH₄⁺).

### Step 4: Determine the Products of Nitrogen Fixation
The products of nitrogen fixation include ammonia (NH₃), which can further be converted into ammonium ions (NH₄⁺) and nitrates (NO₃⁻) through nitrification.

### Step 5: Conclusion
From the above steps, we can conclude that the correct answer to the question is that nitrates (NO₃⁻) are manufactured from molecular nitrogen by bacteria during the nitrogen cycle.

### Final Answer
The answer is: Nitrates (NO₃⁻) are manufactured from molecular nitrogen by bacteria.

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