BIOL165 Lecture Notes - Integrin, Cestoda, Crustacean
23 Apr 2014
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Collagen (long proteins form triple helix that are strong) Proteoglycans (in vivo roles are not well understood) Integrin (connects extracellular matrix to outside of cells) Metazoa extracellular matrix becomes mineralized and forms bones. Diploid, use gametes to reproduce via meiosis sexual and asexual, some use parthenogenesis (reproduction involving unfertilized eggs) Have body cavity lined with peritoneum (traditionally polyphyletic) First fossils date back to late pre-cambrian era. Sponges simplest type of metazoan body: cell masses embedded in gelatinous matrix, supported by skeleton of spicules composed of collagen and calcium carbonate or silica no organs or tissue (sessile: permanently stuck) limited movement. Choanocytes: worker cells, involved with food capture (phagocytosis) Archeocytes: amoeboid cells that move in matrix and change into other cells. Sexual: monoecious (both male and female reproductive organs) Zygote changes into ciliate larva nourished by adult. Cnidarians no head body has 2 layers: epidermis and gastrodermis.
