 Proteins ( / ˈproʊˌtiːnz / or / ˈproʊti.ᵻnz / ) are large biomolecules , or macromolecules , consisting of one or more long chains of amino acid residues . Proteins perform a vast array of functions within organisms , including catalysing metabolic reactions , DNA replication , responding to stimuli , and transporting molecules from one location to another . 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 three @-@ dimensional structure that determines its activity . 
 Proteins ( / ˈproʊˌtiːnz / or / ˈproʊti.ᵻnz / ) <a href='drop_aux' title='1'><mark>are</mark></a>large biomolecules , or macromolecules , consisting of one or more long chains of amino acid residues . Proteins perform a vast array of functions within organisms , including catalysing metabolic reactions , DNA replication , responding to stimuli , and transporting molecules from one location to another . 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 <a href='uninflect' title='2'><mark>results</mark></a> in protein folding into a specific three @-@ dimensional structure <a href='null_relcl' title='3'><mark>that</mark></a><a href='uninflect' title='4'><mark>determines</mark></a> its activity . 
Proteins ( / ˈproʊˌtiːnz / or / ˈproʊti.ᵻnz / ) bigass biomolecules , or macromolecules , consisting of one or more long chains of amino acid residues . Proteins perform a vast array of functions within organisms , including catalysing metabolic reactions , DNA replication , responding to stimuli , and transporting molecules from one location to anotha . Proteins differ from one aanothaprimarily in their sequence of amino acids , which is dictated by da nucleotide sequence of their genes , and which usually result in protein folding into a specific three @-@ dimensional structure determine its activity .