BIOL 204 Study Guide - Midterm Guide: Symmetry In Biology, Amebocyte, Protostome
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*fall 2017 test was ~60% the first 4 pages of this outline* Use study area of mastering biology, he gets a lot of his. ^looking @ previous chapters and their qts they look similar so worth a try. Distinguish between asymmetry , radial symmetry , and bilateral symmetry. Asymmetry : no symmetry, cannot divide body into equal halves. Radial symmetry : top/bottom (oral/aboral), no left/right, no back/front, any plane can divide animal in half. Bilateral symmetry : left/right, dorsal/ventral, anterior/posterior, one plane that divides animal in half. Triploblastic : three germ layers; bilateral animals (protostomes and deuterostomes) Ectoderm : covers the surface of embryo; gives rise to cells in nervous system and those that come in contact with the surface. Endoderm : innermost layer, lining embryonic gut (archenteron), gives rise to lining of digestive tract. Mesoderm : middle layer, only in bilaterian animals, gives rise to muscles and most organs.
