Questions tagged [nitrogen-cycle]

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Will ammonia continue to accumulate in an aquarium tank if a strong antibacterial or chlorine is added to the water?

I've always wondered what would happen if dead plants and fecal matter lay in chlorinated waters and/or waters treated with strong antibacterials or antibiotics. I've heard that aquarium tanks ...
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7 views

Why does number of nephrons increase exponentially in kidney evolution?

The number of nephrons is often depicted to be increasing exponentially in kidney evolution. What is the primary reason for that increase?
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12 views

Water used in excretion in ureotelism vs ammonotelism

Ureotelism is an adaptation to conserve water, less water is needed to excrete nitrogen compared to in ammonotelism. Is the water usage more or less exactly proportional to the number of nitrogen ...
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Any phyla in Animalia that does ammonia assimilation?

A key step in nitrogen metabolism is the initial assimilation of inorganic ammonia into amino acids. Are there phyla within Animalia that do assimilation of ammonium (NH4+)? Phyla with symbionts from ...
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32 views

In biological nitrogen fixation, the electrons required to reduce dinitrogen to ammonia are provided by which compound? [closed]

The reaction is as follows: N2 + 16ATP + 8e- + 8H+ → 2NH3 + H2 + 16ADP + 16Pi From where are the 8 electrons coming from? We know that in photosynthesis, the electrons are supplied by the oxidation ...
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2answers
223 views

Why is urea not converted to ammonia in the body?

After the liver processes metabolites to produce urea and other by-products, these travel in the blood to the heart, then they are oxygenated, and some travel through the renal artery to the kidneys. ...
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1answer
682 views

Difference between bacteria and bacteroids?

During nodule formation Rhizobium is converted to bacteroids. What's the difference between them?
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2answers
497 views

Why do soil bacteria produce nitrous oxide as a result of anhydrous ammonia fertilizer application?

The NPR article and 4 minute audio news item Can Anyone, Even Walmart, Stem The Heat-Trapping Flood Of Nitrogen On Farms? discusses unexpected contributions of greenhouse gasses from the manufacture ...
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2answers
749 views

Recycling and storage of nitrogen from breakdown of macromolecules?

If nitrogen is so important (it's a constituent of both proteins and nucleic acids), why are animals still throwing them out, and needing to eat it again? Is it true that in almost a billion years of ...
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6k views

Why do organisms excrete nitrogenous wastes?

Organisms excrete nitrogenous wastes in the form of urea, uric acid or ammonia. But isn’t that a bit of a waste? There is a shortage of biologically available nitrogen in the ecosystem, and plants ...