| A | B |
|---|
| compound | substance composed of atoms of two or more different elements that are chemically combined |
| molecule | group of atoms held together by covalent bonds; has no overall charge |
| acid | any substance that forms hydrogen ions in water and has a pH below 7 |
| base | any substance that forms hydroxide ions in water and has a pH above 7 |
| macromolecules | large molecules, all consisting of the element carbon |
| polymer | large molecule formed when many smaller molecules bond together |
| peptide bond | covalent bond formed between amino acids |
| enzyme | type of protein found in all living things that breaks things down thereby increasing the rate of chemical reactions |
| nucleic acid | complex macromolecule, such as DNA and RNA, that store genetic information in cells in the form of a code |
| nucleotides | subunits of nucleic acid formed from a simple sugar, a phosphate group, and a nitrogen base |
