Nitrogen fixation

Question 1

Describe molecular nitrogen

Answer 1

N2
Triple bonded to itself 
78% of the Earth's atmosphere 
Very stable and unreactive 
LUCA (lowest universal common ancestor) had nitrogenase

Question 2

Describe what nitrogenase does

Answer 2

Nitrogen + 16 ATP + 8e- + 8H+ are converted to 2 ammonia + 2H + 16ADP + 16 Pi