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BIS+2C+Study+Questions+3+S09-1 - Keen Dehesh W09 BIS 2C...

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Keen & Dehesh W09 -1- BIS 2C Study Questions 3 Fungi and 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 . How many layers occur in a lichen? What is the function of each layer? 3 . Which layer is photosynthetic in a lichen? 4. What feature is shared between fungi and insect exoskeletons? Why would someone say that this feature first evolved in opisthokonts and is ancestral for all metazoans? 5. Biologists develop a new term, dikaryotic or N + N, for fungi. Why did the terms haploid (N) and diploid (2N) not suffice in this case? 6. 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 7. 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 8 . 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? 9. What aspect of lichen biology makes them excellent as indicators of pollution?
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Keen & Dehesh W09 -2- 10. Why is it hard for an organism to survive freezing temperatures? How do lichens solve this problem? How does the same solution permit lichens to become dormant at really high temperatures?
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