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Explanation:
Proteins differ from one another primarily in their sequence of amino acids, which is dictated by the nucleotide sequence of their genes, and which usually results in protein folding into a specific 3D structure that determines its activity. … A protein contains at least one long polypeptide.
Proteins differ from one another because the sequence of amino acids in the polypeptide chain differs from protein to protein. The sequence of amino acids in a given protein is determined by the order and type of nucleotides in its genetic code.
Proteins may be simple or complex. Some proteins are single polypeptides made of several hundred amino acids, whereas others have thousands of subunits—polypeptides that are themselves chains consisting of 20 to 100 amino acids.
Proteins with large numbers of subunits are often globular, spherical structures called oligomeric proteins.
Some oligomeric proteins have thousands of subunits. Many of these complex, multisubunit protein molecules are enzymes that catalyze a chemical reaction in one step and then split up into their component polypeptides to repeat the process when another molecule is available for catalysis.