Nitrogen Fixation

Question 1

Nitrogen fixation is the conversion of ___ into biologically useful ______ by ______

Answer 1

N2, NH4+, nitrogenase

Question 2

Only a few species, mostly bacteria and ____, are able to fix nitrogen

Answer 2

archaea

Question 3

_____ requires significant ATP

Answer 3

fixation

Question 4

N2 is also fixated in the ______ by _____

Answer 4

Atmosphere, lightning

Question 5

Nitrogen is biologically useful only when fully reduced to _____ (___), or the ____ (___) ion

Answer 5

ammonia, NH3, ammonium, NH4+

Question 6

____ catalyzes two reactions

Answer 6

Nitrate reductase

Question 7

Ammonia is primarily incorporated into _____ by ___ distinct enzymes

Answer 7

biological molecules, two

Question 8

_____ synthetase converts _____ to ____, requiring ATP

Answer 8

Glutamine, glutamate, glutamine

Question 9

____ synthase produce ____ from____, does not require ATP

Answer 9

Glutamate, glutamate, glutamine

Question 10

In glutamate synthetase reaction, _____ is first ___ by ATP to activate the molecule

Answer 10

Gluatamate, phosphorylated

Question 11

_____ ion displaces inorganic _____ to yield ____

Answer 11

Ammonium, phosphate, glutamine

Question 12

In glutamate synthase reaction, Ammonia is transferred to ___ (TCA cycle intermediate) to produce ____

Answer 12

alpha-ketoglutarate, glutamate

Question 13

Glutamine is concurrently deaminated to produce a _____

Answer 13

second glutamate molecule