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test_chapter34 - Chapter 34 Vertebrates MULTIPLE CHOICE 1...

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Chapter 34: Vertebrates MULTIPLE CHOICE 1) Which of the following is not a shared characteristic of all chordates? A) pharyngeal clefts B) post-anal tail C) notochord D) dorsal, hollow nerve cord E) four-chambered heart ANS: E PTS: 1 TOP: Concept 34.1 2) What is one characteristic that separates chordates from all other animals? 3) Which of these are characteristics of all chordates during at least a portion of their development? 4) Pharyngeal slits appear to have functioned first as 5) Which of the following statements would be least acceptable to most zoologists? A) The extant cephalochordates are contemporaries, not ancestors, of vertebrates. B) The first fossils resembling cephalochordates appeared in the fossil record around 550 million years ago. C) Recent work in molecular systematics supports the hypothesis that cephalochordates are the most recent common ancestor of all vertebrates. D) The extant cephalochordates are the immediate ancestors of the fishes. E) Cephalochordates display the same method of swimming as do fishes. ANS: D PTS: 1 TOP: Concept 34.1 6) Which extant chordate group is postulated to be most like the earliest chordates in appearance?
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7) Which are extinct organisms that may represent a transition between cephalochordates and vertebrates? 8) A new species of aquatic chordate is discovered that closely resembles an ancient form. It has the following characteristics: external armor of bony plates, no paired fins, and a suspension-feeding mode of nutrition. In addition to these, it will probably have which of the following characteristics?
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