Biol112-Exam2a-08 - version A(note this on your Scantron...

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1 version A (note this on your Scantron) your ID#:___ KEY-A _____ 90 total points possible Biol 112—General Biology II Exam 2 18 February 2008 There are 45 questions worth 2 points each. Choose the one best answer and circle the letter. You must use a ball point pen on this exam sheet; pencil is required for the Scantron form. Only Scantrons submitted with this exam document will be accepted and scored. 1. Which of the following statements provides the strongest evidence that prokaryotes evolved before eukaryotes? a. meteorites that have struck Earth b. abiotic laboratory experiments that produced liposomes c. Liposomes resemble prokaryotic cells. d. The oldest fossilized cells resemble prokaryotes. ! 2. What distinguishes a coelomate animal from a pseudocoelomate animal is that coelomates a. have a body cavity, whereas pseudocoelomates have a solid body. b. contain tissues derived from mesoderm, whereas pseudocoelomates have no such tissue. c. have a body cavity completely lined by mesodermal tissue, whereas pseudocoelomates do not. ! d. have a complete digestive system with mouth and anus, whereas pseudocoelomates have a digestive tract with only one opening. 3. According to one hypothesis, the jaws of vertebrates were derived by the modification of a. scales of the lower lip. b. skeletal rods that had supported pharyngeal (gill) slits. ! c. one or more of the bones of the cranium. d. one or more of the vertebrae. 4. How many half-lives should have elapsed if 12.5% of the parent isotope remains in a fossil at the time of analysis? a. two b. three ! c. four d. five 5. Which two phyla below are most closely related to each other in whichever phylogeny one uses—molecular or morphological? a. Annelida and Arthropoda b. Echinodermata and Chordata ! c. Arthropoda and Nematoda d. Mollusca and Platyhelminthes
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2 6. Which of the following could be considered the most recent common ancestor of living tetrapods? a. a sturdy-finned, shallow-water lobe-fin whose appendages had skeletal supports similar to those of terrestrial vertebrates ! b. an armored, jawed placoderm that had two sets of paired appendages c. an early ray-finned fish that developed bony skeletal supports in its paired fins d. a salamander that had legs supported by a bony skeleton but moved with the side-to-side bending typical of fishes 7. Which of these is not considered an amniote? a. amphibians ! b. non-avian reptiles c. avian reptiles d. egg-laying mammals 8. All of the following are characteristics of the phylum Cnidaria except a. a gastrovascular cavity. b. a polyp stage and/or a medusa stage.
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Biol112-Exam2a-08 - version A(note this on your Scantron...

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