Nitrogen Cycle Flashcards
How many different oxidation states of Nitrogen are present in the Nitrogen Cycle?
8
What is the highest oxidation state of Nitrogen in the Nitrogen Cycle and what form is present in?
+V
Nitrate
NO3-
What is the lowest oxidation state of nitrogen in the Nitrogen Cycle and what form is it present in?
-III (-3)
ammonia
NH3
What is the name of the nitrogen compound immediately below nitrate in the nitrogen cycle and what is its oxidation state?
Nitrite
NO2-
+III (+3)
What nitrogenous compound found in the nitrogen cycle has an oxidation state of +II (+2)?
Nitric oxide
NO
What form of nitrogen in the nitrogen cycle has an oxidation state of +1?
Nitrous Oxide
N2O
What form of nitrogen has zero oxidation state?
Element form
N2
Dintrogen Gas
What form of Nitrogen in the nitrogen cycle has an oxidation state of -1?
Hydroxylamine
NH2OH
What form of nitrogen in the nitrogen cycle has an oxidation state of -2?
Hydrazine
N2H4
What is the name given to the organisms which are involved in oxidising nitrogen in the nitrogen cycle?
Nitro Bacteria
Nitro bacteria convert which form of nitrogen in the nitrogen cycle to nitrate (NO3- ox state +V)?
Nitrite (NO2- ox state +III) oxidised to nitrate
Nitrite oxidation occurs in nitro bacteria, which membrane contains the proteins involved in this reaction?
Membrane between the Cytoplasm and Periplasm
Which membrane protein converts nitrite to nitrate in nitro bacteria?
NOR
Nitrite Oxido Reductase
Nitro bacteria oxidise nitrate (nitrogen cycle), what implication does this have on their rate of growth?
Slow growth
Because only small amounts of energy (ATP) are produced in the oxidation
Which two proteins come after nitrite oxido reductase (NOR) in nitro bacteria during the transport of electrons in nitrite oxidation?
Cyt C then Cyt aa3
What is used as the final electron acceptor in the oxidation of nitrite in nitro bacteria?
oxygen (O2) converted to water (H2O)
Why do nitro bacteria oxidise nitrite?
To use electrons to create a proton gradient for ATP production using ATP synthase
Name two organisms that are involved in the reduction of nitrogenous compounds int he nitrogen cycle?
Pseudomonas stutzeri
E.coli
What is another name given to the process of reducing nitrogenous compounds in the nitrogen cycle?
Denitrification
E.coli and Pseudomonas stuzeri both reduce nitrogenous compounds in the nitrogen cycle, which section of the cycle is similar to both organisms (which nitrogen compounds)?
Nitrate (NO3-) to Nitrite (NO2-)
Where does denitrification take place within Pseudomonas stutzeri?
Periplasm (membrane)
unfinished nitrogen cycle
