Biology Brooker/Widmaier/Graham/Stiling 1st Edition Chapter 32 Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Question 1 Which one of the following statements about animals is incorrect? Animals typically: A) are capable of some type of movement or locomotion in order to acquire food. B) eat multicellular prey. C) lack cell walls. D) comprise the fewest numbers of species of the eukaryotic kingdoms. E) reproduce sexually.

Question 2 True or False: All animal taxa are believed to have evolved from a single common ancestor. A) True B) False

Question 3 Which one of the following animal groups lacks true tissues? A) Chordata B) Arthropoda C) Cnidaria D) Annelida E) Porifera

Question 4 Which one of the following molecules or structures would least likely be found in an animal? A) collagen B) gap junctions C) cellulose D) Hox genes E) muscles

Question 5 Which one of the following is not a traditional, morphological basis for animal classification? A) presence or absence of a true body cavity B) sequence of small subunit ribosomal RNA C) type of body symmetry D) presence or absence of different tissue types E) patterns of embryonic development

Question 6 Match the directionality found in animals on the left with the appropriate description on the right. posterior a. upper anterior b. lower dorsal c. tail ventral d. head A) i = b; ii = a; iii = c; iv = d B) i = d; ii = c; iii = a; iv = b C) i = d; ii = b; iii = a; iv = c D) i = c; ii = d; iii = b; iv = a E) i = c; ii = d; iii = a; iv = b

Question 7 Early cleavage of an animal zygote produces a hollow sphere of cells most accurately referred to as a: A) gastrula. B) blastula. C) ectoderm. D) mesoderm. E) coelom.

Question 8 Animals that exhibit spiral cleavage are most accurately referred to as: A) acoelomates. B) deuterostomes. C) coelomates. D) protostomes. E) pseudocoelomates.

Question 9 Match the developmental term on the left with the appropriate description on the right. schizocoelous development a. development of segmentation metamerism b. solid mass of mesoderm cells splits to form a cavity indeterminate cleavage c. each cell retains the ability to develop into a complete embryo A) i = c; ii = b; iii = a B) i = a; ii = c; iii = b C) i = b; ii = a; iii = c D) i = b; ii = c; iii = a E) i = a; ii = b; iii = c

Question 10 Which one of the following animals would be most likely to exhibit radial cleavage? A) starfish B) chickens C) lobsters D) (A) and (B) E) (A), (B) and (C)

Question 11 True or False: The blastopore becomes the anus of a deuterostome. A) True B) False

Question 12 Which one of the following statements about Hox genes is incorrect? A) The transition from one type of vertebra to another in a vertebrate is controlled by Hox genes. B) Animals have multiple Hox genes. C) The HoxC-6 gene in snakes is positioned such that snakes develop without a neck. D) Relatively simple changes in Hox genes can lead to a wide variety of appendage types. E) All of the above statements about Hox genes are correct.

Question 13 Which one of the following animal traits is believed to have emerged the most recently? A) bilateral symmetry B) endoskeleton C) coelom D) tissues E) body cavity

Question 14 According to molecular sequence data, nematode worms are most closely related to: A) earthworms. B) chimpanzees. C) fruit flies. D) jellyfish. E) snails.

Question 15 True or False: Following the evolutionary split between radiata and bilateria, more phyla became bilateria. A) True B) False

Question 16 Which one of the following is a clade classification within the protostomes? A) Ctenophora B) Ecdysozoa C) Lophotrochozoa D) (B) and (C) E) (A), (B) and (C)

Question 17 The physical basis of classification as an Ecdysozoa is: A) generation of a current to bring food to the mouth. B) the presence of segmentation. C) the molting of a nonliving cuticle. D) radial cleavage during development. E) None of the above accurately represent a basis for Ecdysozoan classification.

Question 18 A closed circulatory system can be found in which one of the following animal phyla? A) Annelida B) Chordata C) Lophophorates D) (A) and (B) E) (A), (B) and (C)

Question 19 Which one of the following is not a characteristic of the Rotifera? A) bilateral symmetry B) acoelomate C) lack of segmentation D) excretory gland cells E) hydrostatic skeleton

Question 20 True or False: Traditional as well as molecular classification methods suggest that the Platyhelminthes are primitive acoelomate animals. A) True B) False

Answer Key 1. D 11. A 2. A 12. E 3. E 13. B 4. C 14. C 5. B 15. A 6. E