Cellular processes are carried out by many different types of molecules, mostly proteins. the function of each protein molecule depends on its shape which, in turn, is determined by the protein's specific sequence of

Explanation:

Proteins are different from one another primarily in the sequence of amino acids, which usually results in proteins folding and determines its activity. A linear chain of amino acid is called a polypeptide chain. Amino acids are the structural and functional unit of proteins.

The sequence and the number of amino acids determines the shape, size and function of the proteins. Each amino acid is interconnected with other amino acid by a covalent bond, which is also known as peptide bond.

answer; a muscle cell, another neuron and a of the above

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.