Question

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SECTION A (approx. 1 hour). Answer on the special MCQ answer sheet provided. Follow the instructions carefully on how to fill this in. Answer ALL questions. 1. An adult animal that possesses bilateral symmetry is most certainly also a) triploblastic b) a deuterostome. c) cucoelomate. d) highly cephalized. 2. Protostome characteristics generally include which of the following? a) a mouth that develops secondarily, and far away from the blastopore b) radial body symmetry c) radial cleavage d) determinate cleavage 3. Which mollusc clade includes members that undergo embryonic torsion? a) chitons b) bivalves c) gastropods d) cephalopods 4. What should be true of fossils of the carliest tetrapods? a) They should show evidence of internal fertilization b) They should show evidence of having produced shelled eges. c) They should indicate limited adaptation to life on land. d) They should be transitional forms with the fossils of chondrichthyans that lived at the same time. 5. Which characteristic(s) is (are) shared by both cnidarians and flatworms? a) dorsoventrally flattened bodies b) true muscle c) radial symmetry d) a digestive system with a single opening 6. Which of the following animals does not feed via a lophophore? a) ectoprot b) brachiopod c) rotifer d) goose barnacle 7. The advantage of excreting nitrogenous wastes as urea rather than as ammonia is that a) ures can be exchanged for Nat. b) urea is less toxic than ammonia c) urca requires more water for excretion than ammonia d) urea does not affect the osmolar gradient 103

Answer 1

1. c. eucoelomate

2. d. determinate clevage

3. c. gastropods

4. c. they should indicate limited adaptations to life on land

5. d. a digestive system with a single opening

6. c. rotifer, d. goose barnacle

7. b. urea is less toxic than ammonia