Matching Pairs ProteinsOnline version proteins part 1 by Danielle Woods 1 primary structure 2 how many nonessential amino acids? 3 protein absorption 4 protein digestion in stomach 5 denaturation of protein 6 peptide bonds 7 how many essential amino acids? 8 protein digestion in small intestine 9 secondary structure 10 tertiary structure 11 basic structure of amino acid 12 quaternary structure unfolding of proteins occurring in presence of heat, acid, base, salt, or mechanical agitation eleven amine group, R group (side chain), carboxyl group, hydrogen single peptide chain, simple linear chain absorbed in small intestine, transported to liver from intestines via portal vein 3D globular shape, folding of polypeptide chain gastrin releases HCl, HCl denatures proteins and converts pepsinogen to pepsin nine two or more polypeptide chains bond together join 2 amino acids together proteases released by pancreas, breaking down polypeptides to dipeptides and tripeptides, which are further broken down into amino acids slightly folded and twisted