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Unformatted text preview: Name (Signature)___________________________________Student ID #__________ 1 BIS 1B Midterm 2. ANSWERS Rosenheim & Kimsey Winter 2003 1. The Cambrian Explosion refers to a. a period of mass extinction occurring during the early Cambrian b. the period when many of the major animal phyla first appeared in the fossil record c. a technique for using data on DNA sequence divergence to estimate when animal groups first appeared d. a major transition from unicellular to multicellular life on earth e. none of the above is true Answer: b 2. Phylogenetic (or cladistic) analysis a. places an emphasis on monophyletic groups b. holds that organisms in a taxon must occupy a shared adaptive zone c. uses symplesiomorphic states to polarize taxa d. infers relationships among taxa based on their possession of unique derived character states e. a and d are correct Answer: e 3. Which of the following is NOT an embryological trait generally observed within the protostome animal phyla a. spiral cleavage b. anus arises from the blastopore c. triploblastic development d. mesoderm arises from the 4d cell (= the mesentoblast) e. coelom arises by schizocoely Answer: b 4. Traits shared by all members of the Kingdom Animalia are a. multicellularity with a cellular division of labor b. collared cells similar to a type found in flagellates c. an ability to respond to environmental stimuli by moving to new locations d. a central nervous system and tissues or organs responsible for excretion e. an ability to regulate salt concentrations associated with filter feeding mechanisms Answer: a 5. Coloniality in the Phylum Cnidaria, Class Hydrozoa, might be favored because: a. it allows different subunits of the colony to become specialized in form and function b. colonies may have an enhanced ability to subdue larger prey c. colonies may have an enhanced ability to compete for space or other resources d. different subunits within a colony can share food via a common gastrovascular cavity e. all of the above are true Answer: e 6. A feeding process inconsistent with a sessile life style would be a. predation by sitting and waiting for prey animals to happen by Name (Signature)___________________________________Student ID #__________ 2 b. filtering small particles from water by passing water through a fine mesh work c. removing small amounts of organic material from large amounts of ingested soil like the feeding process of some annelid worms d. removing plankton suspended in water using a sticky mucus film e. all of the above processes are inconsistent with a sessile life style Answer: c 7. Parasitic species in the Phylum Platyhelminthes, Class Trematoda generally have life cycles a. with one definitive host in which the larval stages reproduce sexually b. with multiple intermediate hosts in which the adult stages reproduce asexually c. with the adult stage producing a small number of heavily-yolked eggs d. in which a huge number of small, inexpensive eggs offsets the very small probability that any one...
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This note was uploaded on 04/15/2008 for the course BIS 1b taught by Professor Kimsey during the Spring '08 term at UC Davis.
- Spring '08