BSC 2011 Lecture 1: Animals Week 1

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Department
Biology - Biological Sciences
Course
BSC 2011
Professor
Norman A Douglas
Semester
Fall

Description
Animals Week 1 Lectures 1, 2, and 3 Characteristics of Animals Multicellularity Heterotrophs Internal digestion Motility Synapomorphies Unique junctions between cells Extracellular molecules such as collagen and proteoglycans Similarities in Hox and other genes Sponges lack: two embryonic cell layers nervous system All animals other than sponges called Eumetozoans Eumetozoans are dipoblastic (have two distinct cell layers) or tripoblastic (three layers) Dipoblasts: Ctenophores, Placozoans, and Cnidarians Symmetry: Cell layers: Tripoblasts Symmetry: Cell layers: Cephalization: formation of a head Can be thought of as a tube within a tube Development starts with a: Two major types o Protostomes: Molluscs, worms, arthropods o Deuterostomes: Echinoderms, hemichordates, CHORDATES Atoms molecules marcomolecules cells tissues organs organ systems As animals develop, groups of cells specialize into tissue types: 1. 2. 3. 4.
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