Nucleic acids 85 Nucleic Acid 69 Enzymes 53 Proteins 51 Amino acids 46 Biochemistry 40 Lipids 37 Proteins-- Peptides-- Amino acids-- Hemoglobin 37 Nucleic Acids 35 DNA 27 soil acidity 26 Enzymology 24 Carbohydrates 23 Acid rain 22 Biology 22 Metabolism-- Nucleic acids 22 Molecular biology 20 Amino acid sequence 18 DNA (Deoxyribo Nucleic Acid) 18 Synthesis 18 Dissertations, Academic (Ph.D) 16 Amino Acid 15 Nucleic acid 14 Amino acids- proteins 13 Carbohydrate 13 Chemistry 13 Cytology 13 Energy metabolisms 13 Fertilizers 13 Lipid metabolisms 13