Is a network of flattened membrane sacs and the small, round membrane-coated vesicles that arise from them. the smooth portion of this organelle constructs fatty acids and phospholipids, which are needed to produce membranes. the rough portion of this organelle is covered with ribosomes, which are small, globular structures composed of rna and protein

step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.

it's c.us forest service