| A | B |
|---|
| atom | smallest particle of matter that retains its chemical properties |
| element | substance composed of only one type of atom |
| electron | tiny moving particles that surround the nucleus |
| ion | An atom that has gained or lost electrons |
| chemical bond | the force holding two atoms or ions together |
| ionic bond | the force of attraction between oppositely charged ions |
| covalent bond | results when two atoms share one or more electrons |
| molecule | group of atoms held together by covalent bonds |
| organic molecule | molecules with carbon-carbon bonds |
| macromolecule | molecules that link together |
| chemical reaction | the forming or breaking of bonds |
| carbohydrate | an organic macromolecule composed of carbon |
| lipid | an organic macromolecule that is not soluble |
| saturated fat | carbon atoms bonded by two hydrogen atoms |
| unsaturated fat | fatty acids linked by double bonds resulting in kinks |
| protein | organic macromolecule composed of long chains of subunits called amino acids |
| nucleic acid | organic macromolecule including DNA and RNA |
| nucleotide | subunits of DNA and RNA |
| chromosome | DNA bundles |
| sensitivity | ability to respond to a stimulus |
