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Cell Metabolism > Nitrogen Cycle > Flashcards

Nitrogen Cycle Flashcards

1
Q

How many different oxidation states of Nitrogen are present in the Nitrogen Cycle?

A

8

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2
Q

What is the highest oxidation state of Nitrogen in the Nitrogen Cycle and what form is present in?

A

+V
Nitrate
NO3-

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3
Q

What is the lowest oxidation state of nitrogen in the Nitrogen Cycle and what form is it present in?

A

-III (-3)
ammonia
NH3

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4
Q

What is the name of the nitrogen compound immediately below nitrate in the nitrogen cycle and what is its oxidation state?

A

Nitrite
NO2-
+III (+3)

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5
Q

What nitrogenous compound found in the nitrogen cycle has an oxidation state of +II (+2)?

A

Nitric oxide
NO

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6
Q

What form of nitrogen in the nitrogen cycle has an oxidation state of +1?

A

Nitrous Oxide
N2O

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7
Q

What form of nitrogen has zero oxidation state?

A

Element form
N2
Dintrogen Gas

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8
Q

What form of Nitrogen in the nitrogen cycle has an oxidation state of -1?

A

Hydroxylamine
NH2OH

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9
Q

What form of nitrogen in the nitrogen cycle has an oxidation state of -2?

A

Hydrazine
N2H4

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10
Q

What is the name given to the organisms which are involved in oxidising nitrogen in the nitrogen cycle?

A

Nitro Bacteria

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11
Q

Nitro bacteria convert which form of nitrogen in the nitrogen cycle to nitrate (NO3- ox state +V)?

A

Nitrite (NO2- ox state +III) oxidised to nitrate

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12
Q

Nitrite oxidation occurs in nitro bacteria, which membrane contains the proteins involved in this reaction?

A

Membrane between the Cytoplasm and Periplasm

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13
Q

Which membrane protein converts nitrite to nitrate in nitro bacteria?

A

NOR
Nitrite Oxido Reductase

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14
Q

Nitro bacteria oxidise nitrate (nitrogen cycle), what implication does this have on their rate of growth?

A

Slow growth
Because only small amounts of energy (ATP) are produced in the oxidation

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15
Q

Which two proteins come after nitrite oxido reductase (NOR) in nitro bacteria during the transport of electrons in nitrite oxidation?

A

Cyt C then Cyt aa3

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16
Q

What is used as the final electron acceptor in the oxidation of nitrite in nitro bacteria?

A

oxygen (O2) converted to water (H2O)

17
Q

Why do nitro bacteria oxidise nitrite?

A

To use electrons to create a proton gradient for ATP production using ATP synthase

18
Q

Name two organisms that are involved in the reduction of nitrogenous compounds int he nitrogen cycle?

A

Pseudomonas stutzeri
E.coli

19
Q

What is another name given to the process of reducing nitrogenous compounds in the nitrogen cycle?

A

Denitrification

20
Q

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)?

A

Nitrate (NO3-) to Nitrite (NO2-)

21
Q

Where does denitrification take place within Pseudomonas stutzeri?

A

Periplasm (membrane)

22
Q

unfinished nitrogen cycle

A

Cell Metabolism (8 decks)

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