RAH_20Lec_202_20__20Animals_20Intro - Hough Lecture Outline...

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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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RAH_20Lec_202_20__20Animals_20Intro - Hough Lecture Outline...

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