protein

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Protein superfood diet Royalty Free Stock Photo

Levels of protein structure from amino acids to Complex of protein molecule Royalty Free Stock Photo

Close up of man with protein shake bottle and jar Royalty Free Stock Photo

Different sources of Protein Food Collection Royalty Free Stock Photo

Protein Rich Foods Royalty Free Stock Photo

Healthy fitness girl with protein shake. Royalty Free Stock Photo

DNA Replication, Protein synthesis, Transcription and translation Royalty Free Stock Photo

Muscle Milk Whey Protein Royalty Free Stock Photo

Protein rich foods in close up Royalty Free Stock Photo

Proteins are large biological molecules, or macromolecules, consisting of one or more long chains of amino acid residues. Proteins perform a vast array of functions within living organisms, including catalyzing metabolic reactions, replicating DNA, 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 folding of the protein into a specific three-dimensional structure that determines its activity.