Chapter 23: The Metabolism of Nitrogen Flashcards
(22 cards)
- Consists of biosynthesis and breakdown of amino acids, purines, and pyrimidines.
Nitogen Metabolism
Metabolism of _________ is related to that of amino acids.
Nitrogen Metabolism
Conversion of ammonia to nitrates
Nitrification
Process by which nitrates and nitrites are broken down to molecular nitrogen
Denitrification
- Reduction of N2 to NH3
Nitrogen Fixation
they are responsible for the reduction and forms of symbiotic relationships that results in nodules on the roots of leguminous pants.
Bacteria
Nitrogen fixation are catalyzed by the _____________________
Nitrogeous enyzme complex
Atmospheric nitrogen is converted to ammonia in its conjugate acid form, ____________
ammonium ion
it is converted to ammonium ion in a six electron reduction.
N2
The only source of nitrogen in the biosphere except for that provided by nitrates.
Nitrogen Fixation
the form of nitrogen that is used in the first stages of the synthesis of organic compounds.
ammonium ion (NH4+)
The conjugate acid form of NH3
ammonium ion (NH4+)
it is obtained by chemical synthesis from nitrogen and hydrogen is that starting point for the production of many synthetic fertilizers, which frequently contain nitrates.
Ammonia
used in reduction of N2 to NH3
6 e-
used in reduction of H+ to H2
2 e-
Several proteins are included in the nitrogenase complex:
- Ferreodxin
- Dinitrogenase reductase
- Dinitrogenase
iron-sulfur (Fe-S) protein
Dinitrogenase reductase
iron-molybdenum (Fe-Mo) protein
Dinitrogenase
The flow of electrons is from ________ to dinitrogenase reductase to _______ to __________.
Ferredoxin
Dinitrogenase
Nitrogen
Process by which the final product of a series of reactions inhibits the first reaction in the series.
Feedback Inhibition in Nitrogen Metabolism
If there is a high level of amino acids or nucleotides, the cell saves energy by not making these compounds through _________
Feedback inhibition mechanism
