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This 2 page Class Notes was uploaded by Kylie O'Laughlin on Tuesday August 16, 2016. The Class Notes belongs to BIOL 303 001 at University of South Carolina taught by in Fall 2016. Since its upload, it has received 4 views.
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Date Created: 08/16/16
Kylie O’Laughlin Dr. Nusnbaum Biology 2108 22 July 2016 Multiple choice questions with explanations 1. What adaptations indicate that echinoderms are more closely related to humans than they are to cnidarians? a. Echinoderms and humans are deuterostomes, cnidarians are protostomes b. Echinoderms exhibit radial symmetry c. Echinoderms have a phase where they exhibit bilateral symmetry d. A and C e. All of the above D is the correct answer. B is only partly true as echinoderms are penta- radially symmetrical. At face value B also supports the idea that cnidarians and echinoderms are more closely related, this eliminates options B and E. D is correct as the bilateral symmetry that echinoderms exhibit at one point is similar to the bilateral symmetry humans exhibit and echinoderms and humans are both deuterostomes, indicating the two are more closely related. 2. Which of the following features is unique to chordates? a. Paired appendages b. Incurrent siphon c. Cranium d. Post-anal tail e. Vertebrae D is correct. A, C, and E are characteristic of all vertebrates, not just chordates. B is not unique to chordates as other organisms, such as bivalves, also have intake siphons. 3. What distinguishes lampreys from sharks? a. Sharks have a vertebral column, which lampreys lack b. Sharks possess jaws, which lampreys lack c. Sharks have boney skeletons, which lampreys lack d. B and C e. None of the above B is correct. Lampreys and sharks both have vertebral columns, hagfish lack this trait which eliminates A. Both sharks and lampreys have cartilage skeletons which eliminates C and D. B is correct, sharks have cartilage jaws but lampreys have no jaws which makes B correct ad E incorrect. 4. Which of the following are not characteristic of osteichthyes? a. Cranium b. Jaws c. Bones mineralized by calcium phosphate d. Cartilaginous skeletons e. Vertebrae D is correct. An easy determinant is that the prefix oste- is used in relation to bones which indicates that the osteichthyes possess a boney skeleton, not a cartilaginous one. 5. Which of the following is true of cephalochordates but not of urochordates? a. Presence of a head b. Possess a tail c. Contain a pharynx d. Notochord extends into the head e. Adults are sessile D is correct, both cephalochordates and urochordates possess a notochord but it only extends into the head of cephalochordates. A, B and C are true of both urochordates and cephalochordates. E is true of urochordates not cephalochordates.
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