| A | B |
|---|
| atom | smallest unit of an element that still retains the properties of that element |
| covalent bond | type of bond formed by the sharing of electrons |
| electron | negatively charged particle found outside the nucleus of an atom |
| ionic bond | bond formed by the attraction of two oppositely charged ions |
| ion | an atom that has either lost or gained an electron and has a positive or negative charge |
| molecule | a group of atoms held together by covalent bonds |
| nucleus | center portion of an atom. It contains the protons and neutrons. |
| proton | positive particle found in the nucleus of an atom |
| neutron | particle found in the nucleus of an atom. It has no charge. |
| matter | anything that has mass and occupies space |
| hydrogen bond | bond formed by polar molecules such as water |
| acid | substance with a pH less than 7 |
| base | substance with a pH greater than 7 |
| amino acid | subunit of proteins |
| simple sugar | subunit of carbohydrates |
| nucleotide | subunit of nucleic acids |
| fatty acid | subunit of fatty acids |
| protein | chain of amino acids; ex enzymes |
| carbohydrate | molecule used for quick energy in the cell; example glucose or starch |
| nucleic acid | molecule that stores the hereditary information, DNA or RNA |
| lipid | molecule used to store energy in the cell long term; also used as insulation in organisms |
| cellulose | carbohydrate molecule used as a structural component in plants |
| organic molecule | molecule that contains carbon, ex carbohydrate |
| inorganic molecule | does not contain carbon, ex water |
| polymer | molecule made from many repeating subunits - ex nucleic acid |
| monomer | molecule made of only one subunit - ex glucose |
