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1019 - Announcements Lecture 1 practice questions 1...

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October 19, 2011 Announcements: Lecture 1 practice questions: 1. pinacocytes are a sponge cell type which... a) produce spicules, a type of skeletal element b) create water current and trap food c) can differentiate into other cell types d) produce an extracellular matrix of collagen e) cover exterior and interior surfaces 2. which of the following is not a characteristic defining an animal a) unique junctions between the cells b) characteristic RNA sequences c) heterotrophy d) motility e) extracellular matrix Animal Diversity 1. Phylum Porifera (Sponges) a) not a member of eumetazoa are a member of parazoa (beside animals) b) sessile suspension feeders c) no distinct embryonic cell layers, so they don't have true tissues d) cell types no complex skeleton, spicules instead (produced by sclerocytes) no true body cavity, no embryonic tissue forming held together by glycoproteins archaeocytes—help organism digest their food no notable organ types 2. Phylum Cnidaria and Ctenophora a)
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