| 1. | Acrosomal Reaction | The Acrosomal reaction is the release of enzymes and other proteins from the acrosomal vesicle of the sperm head that occurs once a sperm has bound to the outer surface of the egg. It helps the s… 0.3 KB |
| 2. | Actin Filaments | Actin filaments are one of the three principal protein filaments of the cytoskeleton. They are involved in cell movement and changes in cell shape. Actin filaments are also part of the contracti… Syn: Microfilaments 0.3 KB |
| 3. | Adaxial-abaxial | In plant leaves, the adaxial-abaxial axis runs from the upper surface to the lower surface (dorsal to ventral) |
| 4. | Adhesion Molecules | Adhesion molecule bind cells to each other and to the extracellular matrix. The main classes of adhesion molecule important in developments are cadherins, the immunoglobulin superfamily and the i… 0.2 KB |
| 5. | Adhesive glands | adhesive glands are paired ectodermal thickenings found of the ventral surface of anuran embryos that secrete adhesive mucus. Synonyms: cement glands, mucous glands, oral suckers |
| 6. | Albumin | The egg white of birds eggs formed in the oviduct before the addition of the shell. It provides protein and water to the developing embryo and protection from microorganisms. |
| 7. | Allantois | The allantois is a set of extra embryonic membranes that develops in some vertebrate embryos. In bird and repltile embryos it acts as a respiratory surface, while in mammals its blood vessel car… 0.2 KB |
| 8. | Allele | An allele is a particular version of a gene. In diploaid orgranisms two alleles of each gene are present, which may or may not be the same. |
| 9. | Allometry | Allometry is the mathematical study of the relative growth of parts of an organisms. |
| 10. | Amniote | A species of animal which possesses an amnion. This term is most often used in the plural (amniotes) to refer to reptiles, birds, and mammals collectively. |
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