Protein

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protein model mosaic.

Proteins are lairge biological molecules, or macromolecules, consistin o ane or mair chains o amino acid residues. Proteins perform a vast array o functions athin organisms, includin catalysin metabolic reactions, DNA replication, respondin tae stimuli, an transportin molecules frae ane location tae anither. Proteins differ frae ane anither primarily in thair sequence o amino acids, that is dictatit bi the nucleotide sequence o thair genes, an that uisually results in protein foldin intae a speceefic three-dimensional structur that determines its acteevity.