Which function do the integral proteins in the phospholipid bilayer perform?
a. maintain the fluidity of the cell membrane
b. transport particles in and out of the cell
c. maintain the integrity of the cell membrane
d. provide energy to the cell

explanation:

b,bacteria convert nitrates

into nitrogen gas.

d,plants and animals take in

and use nitrogen compounds.

e,bacteria break down waste    

products and return nitrogen  

to the soil.

a,bacteria convert atmospheric

nitrogen to ammonia.

c,bacteria convert ammonia

to nitrites and nitrates.

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