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| 2655604638 | organic compound | A chemical compound containing carbon. | 0 | |
| 2655615058 | macromolecule | A giant molecule formed by the joining of smaller molecules, usually by a dehydration reaction. Polysaccharides, proteins, and nucleic acids. | 1 | |
| 2655641006 | valence | The bonding capacity of a given atom; the number of covalent bands an atom can form usually equals the number of unpaired electrons in its outermost shell. | 2 | |
| 2670124982 | hydrocarbon | An organic molecule consisting of only carbon and hydrogen. | 3 | |
| 2670131105 | hydroxyl group | A chemical group consisting of an oxygen atom joined to a hydrogen atom. Molecules possessing this group are soluble in water and are called alcohols. | 4 | |
| 2670131106 | carbonyl group | A chemical group present in aldehydes and ketones and consisting of a carbon atom double-bonded to an oxygen atom. | 5 | |
| 2670131486 | carboxyl group | A chemical group present in organic acids and consisting of a single carbon atom double-bonded to an oxygen atom and also bonded to a hydroxyl group. | 6 | |
| 2670131487 | amino group | A chemical group consisting of a nitrogen atom bonded to two hydrogen atoms; can act as a base in solution, accepting a hydrogen ion and acquiring a charge of 1+. | 7 | |
| 2670132063 | sulfhydryl group | A chemical group consisting of a sulfur atom bonded to a hydrogen atom. | 8 | |
| 2670132064 | phosphate group | A chemical group consisting of a phosphorus atom bonded to four oxygen atoms; important in energy transfer. | 9 | |
| 2670138826 | methyl group | A chemical group consisting of a carbon bonded to three hydrogen atoms. May be attached to a carbon or to a different atom. | 10 | |
| 2670143082 | functional group | A specific configuration of atoms commonly attached to the carbon skeletons of organic molecules and involved in chemical reactions. | 11 | |
| 2670205323 | adenosine triphosphate | An adenine-containing nucleoside triphosphate that releases free energy when its phosphate bonds are hydrolyzed. This energy is used to drive endergonic reactions in cells. | 12 | |
| 2670226582 | polymer | A long molecule consisting of many similar or identical monomers linked together by covalent bonds. | 13 | |
| 2670227341 | monomer | The subunit that serves as the building block of a polymer. | 14 | |
| 2670228075 | enzyme | A macromolecule serving as a catalyst, a chemical agent that increases the rate of a reaction without being consumed by the reaction. Most are proteins. | 15 | |
| 2670228904 | dehydration reaction | A chemical reaction in which two molecules become covalently bonded to each other with the removal of a water molecule. | 16 | |
| 2670248646 | hydrolysis | A chemical reaction that breaks bonds between two molecules by the addition o water; functions in disassembly of polymers to monomers. | 17 | |
| 2670306971 | carbohydrate | A sugar (monosaccharide) or one o its dimers (disaccharide) or polymers (polysaccharides). | 18 | |
| 2670308571 | monosaccharide | The simplest carbohydrate, active alone or serving as a monomer for disaccharides and polysaccharides. Also known as simple sugars, and they have molecular formulas that are generally some multiple of CH2O. | 19 | |
| 2670315007 | disaccharide | A double sugar, consisting of two monosaccharides joined by a glycosidic linkage formed by a dehydration reaction. | 20 | |
| 2670317634 | glycosidic linkage | A covalent bond formed between two monosaccharides by a dehydration reaction. | 21 | |
| 2670321340 | polysaccharide | A polymer of many monosaccharides, formed by dehydration reactions. | 22 | |
| 2670326649 | starch | A storage polysaccharide in plants, consisting entirely of glucose monomers joined by alpha glycosidic linkages. | 23 | |
| 2670471414 | glycogen | An extensively branched glucose storage polysaccharide found in the liver and muscle of animals; the animal equivalent of starch. | 24 | |
| 2670481068 | cellulose | A structural polysaccharide of plant cell walls, consisting of glucose monomers joined by beta glycosidic linkages. | 25 | |
| 2670482992 | chitin | A structural polysaccharide, consisting of amino sugar monomers, found in many fungal cell walls and in the exoskeletons of all arthropods. | 26 | |
| 2670512430 | lipid | Any of a group of large biological molecules, including fats, phospholipids, and steroids, that mix poorly, if at all, with water. | 27 | |
| 2670514148 | fat | A lipid consisting of three fatty acids linked to one glycerol molecule; also called a triacylglycerol or triglyceride. | 28 | |
| 2670519218 | fatty acid | A carboxylic acid with a long hydrocarbon chain. They vary in length and in the number and location of double bonds. | 29 | |
| 2670519219 | triacylglycerol | A lipid consisting of three fatty acids linked to one glycerol molecule; also called a fat or triglyceride. | 30 | |
| 2670521354 | triglyceride | Another name for fat that is often found in the list of ingredients on packaged foods. | 31 | |
| 2670524386 | saturated fatty acid | A fatty acid in which all carbons in the hydrocarbon tail are connected by single bonds, thus maximizing the number of hydrogen atoms attached to the carbon skeleton. | 32 | |
| 2670551408 | unsaturated fatty acid | A fatty acid that has one or more double bonds between carbons in the hydrocarbon tail. Such bonding reduces the number of hydrogen atoms attached to the carbon skeleton. | 33 | |
| 2670616199 | phospholipid | A lipid made up of glycerol joined to two fatty acids and a phosphate group. The hydrocarbon chains of the fatty acids act as nonpolar, hydrophobic tails, while the rest of the molecule acts as a polar, hydrophilic head. They form bilayers that function as biological membranes. | 34 | |
| 2670621072 | steroid | A type of lipid characterized by a carbon skeleton consisting on four fused rings with various chemical groups attached. | 35 | |
| 2670623595 | cholesterol | A steroid that forms an essential component of animal cell membranes and acts as a precursor molecule for the synthesis of other biologically important steroids, such as many hormones. | 36 | |
| 2670926851 | catalyst | A chemical agent that selectively increases the rate of a reaction without being consumed by the reaction. | 37 | |
| 2670932077 | polypeptide | A polymer of many amino acids linked together by peptide bonds. | 38 | |
| 2670932078 | protein | A biologically functional molecule consisting of one or more polypeptides folded and coiled into a specific three-dimensional structure. | 39 | |
| 2670939164 | amino acid | An organic molecule possessing both a carboxyl and an amino group. They serve as the monomers of polypeptides. | 40 | |
| 2670983786 | peptide bond | The covalent bond between the carboxyl group on one amino acid and the amino group on another, formed by a dehydration reaction. | 41 | |
| 2670987225 | primary structure | The level of protein structure referring to the specific linear sequence of amino acids. | 42 | |
| 2670990209 | secondary structure | Regions of repetitive coiling or folding of the polypeptide backbone of a protein due to hydrogen bonding between constituents of the backbone (not the side chains). | 43 | |
| 2670991608 | alpha helix | A coiled region constituting one form of the secondary structure of proteins, arising from a specific pattern of hydrogen bonding between atoms of the polypeptide backbone (not the side chains). | 44 | |
| 2671021869 | beta pleated sheet | One form of the secondary structure of proteins in which the polypeptide chain folds back and forth. Two regions of the chain lie parallel to each other and are held together by hydrogen bonds between atoms of the polypeptide backbone (not the side chains). | 45 | |
| 2671023750 | tertiary structure | The overall shape of a protein molecule due to interactions of amino acid side chains, including hydrophobic interactions, ionic bonds, hydrogen bonds, and disulfide bridges. | 46 | |
| 2671028237 | hydrophobic interaction | A type of weak chemical interaction caused when molecules that do not mix with water coalesce to exclude water. | 47 | |
| 2671031736 | disulfide bridges | A strong covalent bond formed when the sulfur of one cysteine monomer bonds to the sulfur of another cysteine monomer. | 48 | |
| 2671047401 | quaternary structure | The particular shape of a complex, aggregate protein, defined by the characteristic three-dimensional arrangement of its constituent subunits, each a polypeptide. | 49 | |
| 2671114300 | sickle-cell disease | A recessively inherited human blood disorder in which a single nucleotide change in the beta-globin gene causes hemoglobin to aggregate, changing red blood cell shape and causing multiple symptoms in afflicted individuals. | 50 | |
| 2671139383 | denaturation | In proteins, a process in which a protein loses its native shape due to the disruption of weak chemical bonds and interactions, thereby becoming biologically inactive. | 51 | |
| 2671141928 | x-ray crystallography | A technique used to study the three-dimensional structure of molecules. It depends on the diffraction of an X-ray beam by the individual atoms of a crystallized molecule. | 52 | |
| 2671721504 | gene | A discrete unit of hereditary information consisting of a specific nucleotide sequence in DNA (or RNA, in some viruses). | 53 | |
| 2671721751 | nucleic acid | A polymer (polynucleotide) consisting of many nucleotide monomers, serves as a blueprint for proteins and, through the actions of proteins, for all cellular activities. The two types are DNA and RNA. | 54 | |
| 2671722950 | deoxyribonucleic acid | A nucleic acid molecule, usually a double-stranded helix, in which each polynucleotide strand consists of nucleotide monomers with a deoxyribose sugar and the nitrogenous bases adenine (A), cytosine (C), guanine (G), and thymine (T); capable of being replicated and determining the inherited structure of a cell's proteins. | 55 | |
| 2671723576 | ribonucleic acid | A type of nucleic acid consisting of a polynucleotide made up of nucleotide monomers with a ribose sugar and the nitrogenous bases adenine (A), cytosine (C), guanine (G), and uracil (U); usually single-stranded; functions in protein synthesis, gene regulation, and as the genome of some viruses. | 56 | |
| 2671727936 | polynucleotide | A polymer consisting of many nucleotide monomers in a chain. The nucleotides can be those of DNA or RNA. | 57 | |
| 2671727937 | nucleotide | The building block of a nucleic acid, consisting of a five-carbon sugar covalently bonded to a nitrogenous base and one or more phosphate groups. | 58 | |
| 2671728727 | pyrimidine | One of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring. Cytosine (C), thymine (T), and uracil (U). | 59 | |
| 2671730878 | purine | One of two types of nitrogenous bases found in nucleotides, characterized by a six-membered ring fused to a five-membered ring. Adenine (A) and guanine (G). | 60 | |
| 2671730879 | deoxyribose | The sugar component of DNA nucleotides, having one fewer hydroxyl group than ribose, the sugar component of RNA nucleotides. | 61 | |
| 2671734041 | ribose | The sugar component of RNA nucleotides. | 62 | |
| 2671734042 | double helix | The form of native DNA, referring to its two adjacent antiparallel polynucleotide strands wound around an imaginary axis into a spiral shape. | 63 | |
| 2671734286 | antiparallel | Referring to the arrangement of the sugar-phosphate backbones in a DNA double helix (they run in opposite 5' to 3' directions). | 64 | |
| 2671735219 | complementary | Each strand of a DNA double helix is the predictable counterpart of the other. | 65 |
