Sulfanilamide is active in bacteria but not in higher animals,why? Bacteria synthesize their own folic acid,whereas higher animals obtain folic acid from their diet.细菌自己合成叶酸，而高等动物从饮 食中获取叶酸. H2N SO2NH2 H2N COOH (a)Sulfanilamide (b)p-Aminobenzoic acid H CH2 N- o=0- COOH HN-C-H CH2 CH2 COOH (c)Folic acid 2012 Pearson Education.ineSulfanilamide is active in bacteria but not in higher animals,why? Bacteria synthesize their own folic acid, whereas higher animals obtain folic acid from their diet.细菌自己合成叶酸, 而高等动物从饮 食中获取叶酸