| A | B |
| fatty acid | long hydrocarbon chain with carboxyl group on one end |
| hydrophilic | substance that will dissolve in water |
| hydrophobic | substance that will not dissolve in water |
| isomer | molecules with the same molecule formula but different molecular arrangement |
| lipid | organic group with C, H, and few O |
| monosaccharide | single sugar |
| nucleic acid | DNA and RNA |
| nucleotide | monomer of nucleic acids |
| peptide bond | bond between the C of th Carboxyl group and the N of the amine group characteristic of proteins |
| phospholipid | glycerol, phosphate and one fatty acid; major component of cell membrane |
| polysaccharide | polymer of carbs |
| RNA | ribonucleic acid |
| substrate | substance acted upon by an enzyme |
| triglyceride | glycerol + 3 fatty acids |
| wax | long fatty acid chain joined to a long alcohol chain |
| saturated fatty acid | has only single bonds |
| unsaturated fatty acid | has a double or triple bond |
| nucleotide | composed of pentose sugar, nitrogenous base and a phosphate |
| amine group | nitrogen atom bonded to 2 hydrogen atoms |
| enzyme | organic molecule that acts as a catalyst |