| A | B |
|---|
| Name | Definition |
| biomass | the total mass of all living matter |
| polar molecule | a molecule that has a positive end and a negative end because of unequal sharing of electrons |
| nonpolar molecule | a molecule that shares electrons equally and does not have oppositely charged ends |
| element | a substance that cannot be broken down into simpler substances |
| organic compounds | a compound that contains the element carbon |
| hydrocarbons | molecules that contain only carbon and hydrogen atoms |
| saturated hydrocarbon | a compound that contains only single covalent bonds between carbon atoms |
| unsaturated hydrocarbon | a compound that contains at least one double or triple covalent bond between carbon atoms |
| functional group | a group of atoms that replaces a hydrogen atom in organic compounds |
| amino acid | a member of a class of organic compounds that are the basic building blocks of proteins |
| covalent bond | a chemical bond that forms when atoms share electrons |
| polymer | a large molecule formed from smaller molecules called monomers |
| monomer | a small molecule that forms a link in a polymer chain |
| synthetic polymer | human-made polymer compounds that are not found in nature |
| natural polymer | made by living organisms, such as proteins, complex carbohydrates, and nucleic acids |
| biomolecule | a large organic molecule found in living organisms |
| lipid | a biological compound, including fats and oils, that is not soluble in water and contains carbon, hydrogen, and oxygen |
| nucleic acid | a biomolecule, such as RNA or DNA, that stores cellular information in cells in all plants and animals |
| carbohydrate | an organic compound used by cells to store and release energy |
| compound | a pure substance that contains two or more elements |
