Peptide yog ib qho biochemical ntawm amino acid thiab protein. Nws muaj qhov hnyav dua molecular dua li cov protein, tab sis qhov hnyav molecular dua li cov amino acid. Nws yog ib feem ntawm cov protein. Uas yog hais tias, los ntawm ntau tshaj ob los yog mus rau kaum ob ntawm amino acid peptide daim ntawv cog lus polymerization rau hauv peptide, thiab tom qab ntawd los ntawm ntau peptides nrog sab chains polymerization rau hauv cov protein. Ib qho amino acid tsis tuaj yeem hu ua peptide, yuav tsum muaj ntau dua ob lub amino acids txuas los ntawm peptide saw compound kom hu ua peptide; Ntau cov amino acids sib xyaw ua ke tsis yog hu ua peptides; Amino acids yuav tsum tau txuas los ntawm peptide bonds, tsim "amino acid chain", "amino acid string", txoj hlua ntawm cov amino acids tuaj yeem hu ua peptide. .