S: (n) enzyme (any of several complex proteins that are produced by cells and act as catalysts in specific biochemical reactions)
S: (n) protein (any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of polymers of amino acids; essential in the diet of animals for growth and for repair of tissues; can be obtained from meat and eggs and milk and legumes) "a diet high in protein"
S: (n) aldehyde (any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids)
S: (n) aliphatic compound (organic compound that is an alkane or alkene or alkyne or their derivative)
S: (n) alkylbenzene (organic compound that has an alkyl group bound to a benzene ring)
S: (n) alkyl halide, haloalkane (organic compound in which halogen atoms have been substituted for hydrogen atoms in an alkane)
S: (n) amino acid, aminoalkanoic acid (organic compounds containing an amino group and a carboxylic acid group) "proteins are composed of various proportions of about 20 common amino acids"
S: (n) diamine (any organic compound containing two amino groups)
S: (n) enol (an organic compound that contains a hydroxyl group bonded to a carbon atom which in turn is doubly bonded to another carbon atom)
S: (n) halon (a compound in which the hydrogen atoms of a hydrocarbon have been replaced by bromine and other halogen atoms; very stable; used in fire extinguishers although it is thought to release bromine that depletes the ozone layer)
S: (n) peptone (any of various water-soluble compounds that form by hydrolysis in the digestion of proteins to amino acids)
S: (n) quaternary ammonium compound (a compound derived from ammonium with hydrogen atoms replaced by organic groups; used as surface-active agents, disinfectants, and in drugs)
S: (n) proenzyme, zymogen (any of a group of compounds that are inactive precursors of enzymes and require some change (such as the hydrolysis of a fragment that masks an active enzyme) to become active)
S: (n) propylthiouracil (a crystalline compound used as an antithyroid drug in the treatment of goiter)
S: (n) ether (any of a class of organic compounds that have two hydrocarbon groups linked by an oxygen atom)
S: (n) acetal (any organic compound formed by adding alcohol molecules to aldehyde molecules)
S: (n) aldol, aldehyde-alcohol (an oily colorless liquid obtained by the condensation of two molecules of acetaldehyde; contains an alcohol group (-OH) and an aldehyde group (-CHO))
S: (n) thiazine (a compound made up of a ring of four carbon atoms and one sulfur atom and one nitrogen atom)
S: (n) cacodyl, tetramethyldiarsine (a poisonous oily liquid with a garlicky odor composed of 2 cacodyl groups; undergoes spontaneous combustion in dry air)
S: (n) glycoside (a group of compounds derived from monosaccharides)
S: (n) resin, rosin (any of a class of solid or semisolid viscous substances obtained either as exudations from certain plants or prepared by polymerization of simple molecules)
S: (n) halocarbon (one of various compounds of carbon and any of the halogens)
S: (n) hemiacetal (an organic compound usually formed as an intermediate product in the preparation of acetals from aldehydes or ketones)
S: (n) pyrimidine (a heterocyclic organic compound with a penetrating odor)
S: (n) quassia (a bitter compound used as an insecticide and tonic and vermifuge; extracted from the wood and bark of trees of the genera Quassia and Picrasma)
S: (n) steroid (any of several fat-soluble organic compounds having as a basis 17 carbon atoms in four rings; many have important physiological effects)
S: (n) urea, carbamide (the chief solid component of mammalian urine; synthesized from ammonia and carbon dioxide and used as fertilizer and in animal feed and in plastics)
S: (n) imide (any of a class of organic compounds that contain the divalent radical -CONHCO-)
S: (n) xanthine (crystalline oxidation product of the metabolism of nucleoproteins; precursor of uric acid; found in many organs and in urine)
S: (n) catalyst, accelerator ((chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected)
S: (n) activator ((biology) any agency bringing about activation; a molecule that increases the activity of an enzyme or a protein that increases the production of a gene product in DNA transcription)
S: (n) substance (the real physical matter of which a person or thing consists) "DNA is the substance of our genes"
S: (n) matter (that which has mass and occupies space) "physicists study both the nature of matter and the forces which govern it"
S: (n) entity (that which is perceived or known or inferred to have its own distinct existence (living or nonliving))
S: (n) part, portion, component part, component, constituent (something determined in relation to something that includes it) "he wanted to feel a part of something bigger than himself"; "I read a portion of the manuscript"; "the smaller component is hard to reach"; "the animal constituent of plankton"
S: (n) relation (an abstraction belonging to or characteristic of two entities or parts together)