| A | B |
|---|
| Atom | smallest unit of matter that can be broken down by chemical means. |
| element | Substance composed of a single type of atom |
| compound | substance made of more than one kind of atom |
| molecule | group of atoms held together by covalent bonds |
| ion | electrically charged atom or molecule |
| cohesion | attraction between substances of the same kind |
| adehsion | attraction between different substances |
| solution | homogeneous mixture of 2 or more substances |
| acid | compound that increases theconcentration of H ions in a solution |
| base | compound that reduces the concentration of H ions in a solution |
| carbohydrate | organic compound composed of C,H, and O used as energy source of living things |
| monoscaccharide | simple sugar |
| lipid | member of the family of nonpolar organic molecules not soluable in water |
| protein | orgainc compound made of amino acids |
| amino acid | organic molecule that is building block of proteins |
| nucleic acid | organic molecule made of nucleotides |
| nucleotide | subunit of nucleic acids |
| DNA | double stranded helical nucleic acid |
| RNA | nucleic acid involved in protein synthesis |
| ATP | main energy currency of cells |
| energy | capacity to do work |
| activation energy | amount of energy required to start a chemical reaciton |
| enzyme | substance speeds up chemical reactions |
| substrate | substance on which an enzyme acts during a chemical reaction |
| active site | site on enzyme that attaches to a substrate |
