| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | acinus | biology | A small sac-like structure forming part of a gland, especially the exocrine glands. | 1 |
| 2 | acrosome | biology | A structure found in the head of a sperm cell that contains enzymes to help penetrate the egg during fertilization. | 1 |
| 3 | acrosome | biology | The acrosome is an important structure in the sperm cell that contains enzymes to help penetrate the egg during fertilization. | 1 |