What is the nitrogen cycle?

What is this process in the nitrogen cycle?

• What is the process where nitrogen gas is transferred into protein in plants, and what organism is responsible for this? Thanks

• Answer:

  The main component of the nitrogen cycle starts with the element nitrogen in the air. Two nitrogen oxides are found in the air as a result of interactions with oxygen. Nitrogen will only react with oxygen in the presence of high temperatures and pressures found near lightning bolts and in combustion reactions in power plants or internal combustion engines. Nitric oxide, NO, and nitrogen dioxide, NO2, are formed under these conditions. Eventually nitrogen dioxide may react with water in rain to form nitric acid, HNO3. The nitrates thus formed may be utilized by plants as a nutrient. These nitrates are used to combine with the products of photosynthesis to form proteins More on the link below click and read ----- http://www.elmhurst.edu/~chm/onlcourse/chm110/outlines/nitrogencycle.html http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/N/NitrogenCycle.html