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Keen Spring 2011 -1- BIS 2C Study Questions Metazoans 1. The cnidarian life cycle contains polyps, medusae, and a free-swimming larva. Explain which parts of the life cycle are made by asexual reproduction, which are made by sexual reproduction, and which engage in sexual reproduction 2. What shared feature is found in fungi and in insect exoskeletons? Explain what facts and interpretations could be used to state that this feature first evolved in opisthokonts and is ancestral for all metazoans. 3. Biologists develop a new term, dikaryotic or N + N, for fungi. Why did the diplontic life cycle terms haploid (N) and diploid (2N) not suffice in this case? 4. Which of the following organisms belong to the group of cnidarians without a medusa stage in the life cycle? large ocean-going jellies sea anemones corals cubozoans the polyp stage of hydrozoans 5. Bivalves are unusual molluscs because: a) they have a foot b) they have a mantle c) they lack a radula d) they have a closed circulatory system e) they have gills 6 . What is the Principle of Continuity and how does a sponge use it to slow water down during food collection and to speed water up as it exits the body? 7. How does segmentation permit an annelid to anchor its body?
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Keen Spring 2011 -2- 8 . How does segmentation permit an annelid to push forward into a burrow? 9 . Why is it essential that the annelid segments be isolated from each other by septa? 10 . Which of the following taxa are segmented? a) annelids b) chordates c) arthropods d) molluscs e) a, b, and c 11 . Define each of the following statements as true or false: Poriferans (sponges) are a monophyletic group. Fungi can catch and eat nematode worms. Choanoflagellates share choanocytes with sponges. Multicellular organisms use cell-cell communication. An extracellular matrix may contain collagen. Multicellular animals use cell-cell adhesion. Echinoderms have a backbone.
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This note was uploaded on 10/23/2011 for the course BIS 101 taught by Professor Simonchan during the Spring '08 term at UC Davis.

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