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 NOTan embryological trait generally observed within the protostome animal phyla 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: 6. A feeding process inconsistent with a sessile life style would be a. predation by sitting and waiting for prey animals to happen by
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