Nitrogen Cycle
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8 Terms
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main reservoir of N
the atmosphere (nitrogen is N2 gas)
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purpose
makes DNA and RNA, acids, amino acids, proteins
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Nitrogen fixation
conversion of N2 from air into ammonia by bacteria
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assimilation
uptake of nitrogen compounds by plants to build molecules
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ammonification
decomposers convert nitrogen in dead matter into ammonia
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nitrification
bacterial conversion of ammonia into nitrates
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dentrification
bacterial process that converts nitrates back to N2 gas, nitrogen returns to atmosphere
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human impact
fertilizers/fossil fuel increase nitrogen, leading to pollution/imbalance
Note 
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