5 of the Biology glossary’s terms, each with the part of the syllabus where you first meet it.
The line at each end of a sarcomere to which the thin actin filaments are anchored; the distance between two Z-lines is one sarcomere.
A thick layer of glycoproteins surrounding the plasma membrane of a mammalian egg, to which sperm bind before fertilisation.
An infectious disease that can be transmitted from other animal species to humans.
Single-celled photosynthetic algae (dinoflagellates) that live inside the cells of hard corals in a mutualistic relationship, supplying the coral with products of photosynthesis.
The diploid cell formed when the nuclei of a male and a female gamete fuse at fertilisation; the first cell of a new organism.