What are the building blocks of proteins?
a. polysaccharides
b. amino acids
c. glucose molecules
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d. nucleic acids

B. amino acids

Explanation: Proteins are important macromolecules for cells, they carry out functions as structural blocks, enzymes for metabolism, receptors, antibodies, etc. They are made of aminoacids bond to each other by peptidic bonds and the aminoacidic sequence determine the folding of the protein and its function.

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.

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