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Unformatted text preview: Hough Lecture Outline – Animals Intro 1 ANIMAL KINGDOM (Introduction) A vastly diverse group ranging in size from microscopic to many tons, and ranging in complexity from simple cell aggregates t o enormously complex intelligent beings with interacting organ systems. All animals share common ancestry, especially with regard to several general traits: • unique ribosomal RNA • unique extracellular matrix molecules for cell-cell binding, including specific proteins (e.g. collagen) and glycoproteins • multicellular and mostly motile (at least as larvae) • heterotrophic by ingestion of complex organic matter (except for endoparasitic species) • unique embryonic development (including gastrulation in all but sponges) and unique tissues Animals differ from plants in several basic ways (in addition to obvious ones of motility and energy source): • no cell walls • storage carbohydrate as glycogen (not starch) • structural carbohydrate as chitin (not cellulose) • sexual cycle has a dominant diploid phase, following gametic meiosis (as compared with alternate plant generations and sporic meiosis) Hough Lecture Outline – Animals Intro 2 Evolutionary relationships and classification in animals are based,...
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- Winter '08
- Developmental Biology, Germ layer, Phylum, Mesoderm, Annelid