| A | B |
|---|
| embryology | the study of the stages before birth |
| endocytosis | the process by which a cell takes in material by folding the cell membrane around the material |
| endoplasmic reticulum | an organelle in which parts of the cell membrane are made and some proteins are chemically modified |
| enzyme | catalyst that speed up the rates of biochemical reactions by lowering the activation energy |
| eukaryotic | cell that contain a nucleus |
| exocytosis | the process by which a cell releases large amounts of material using folds in the cell membrane |
| extinction | the death of all individuals within a species. |
| facilitated diffusion | the movement of specific molecules across the membrane via protein channels embedded in the cell membrane |
| fermentation | anaerobic reactions, which produce energy but not as efficiently as do aerobic reactions |
| fertilization | union of male and female gametes to form a zygote |
| fitness | the trait that allows an organism to be best suited to its environment so it can survive and reproduce |
| flagella | long whiplike structures that aid in the movement of some cells |
| fossil | the preserved remains of ancient organisms |
| fossil record | provides evidence that life on Earth has changed over time |
| frameshift | a mutation where a nitrogenous base is added or deleted |
