Cambell ch. 32 study guide

Card Set Information

Author:
coolcat10156
ID:
271387
Filename:
Cambell ch. 32 study guide
Updated:
2014-04-21 19:00:13
Tags:
biology
Folders:
science,biology
Description:
Cambell biology ch. 32 study guide
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user coolcat10156 on FreezingBlue Flashcards. What would you like to do?


  1. 1) Both animals and fungi are heterotrophic. What distinguishes animal
    heterotrophy from fungal heterotrophy is that only animals derive their
    nutrition by
    A) preying on animals.
    B) ingesting it.
    C) consuming living, rather than dead, prey.
    D) using enzymes to digest their food.
    b
  2. 2) The larvae of some insects are merely small versions of the adult,
    whereas the larvae of other insects look completely different from
    adults, eat different foods, and may live in different habitats. Which
    of the following most directly favors the evolution of the latter, more
    radical, kind of metamorphosis?
    A) natural selection of sexually immature forms of insects
    B) changes in the homeobox genes governing early development
    C) the evolution of meiosis
    D) the development of an oxidizing atmosphere on Earth
    E) the origin of a brain
    b
  3. 3) Which of the following is (are) unique to animals?
    A) cells that have mitochondria
    B) the structural carbohydrate, chitin
    C) nervous conduction and muscular movement
    D) heterotrophy
    E) Two of these responses are correct.
    c
  4. 4) What do animals as diverse as corals and monkeys have in common?
    A) body cavity between body wall and digestive system
    B) number of embryonic tissue layers
    C) type of body symmetry
    D) presence of Hox genes
    E) degree of cephalization
    d
  5. 5) The Hox genes came to regulate each of the following in what sequence, from earliest to most recent?
    1. identity and position of paired appendages in protostome embryos
    2. anterior-posterior orientation of segments in protostome embryos
    3. positioning of tentacles in cnidarians
    4. anterior-posterior orientation in vertebrate embryos
    A) 4 → 1 → 3 → 2
    B) 4 → 2 → 3 → 1
    C) 4 → 2 → 1 → 3
    D) 3 → 2 → 1 → 4
    E) 3 → 4 → 1 → 2
    d
  6. 6) In individual insects of some species, whole chromosomes that carry
    larval genes are eliminated from the genomes of somatic cells at the
    time of metamorphosis. A consequence of this occurrence is that
    A) we could not clone a larva from the somatic cells of such an adult insect.
    B) such species must reproduce only asexually.
    C) the descendents of these adults do not include a larval stage.
    D) metamorphosis can no longer occur among the descendents of such adults.
    E) Two of these responses are correct.
    a
  7. 7) The last common ancestor of all animals was probably a
    A) unicellular chytrid.
    B) unicellular yeast.
    C) multicellular algae.
    D) multicellular fungus.
    E) flagellated protist.
    e
  8. 8) Evidence of which structure or characteristic would be most surprising to find among fossils of the Ediacaran fauna?
    A) true tissues
    B) hard parts
    C) bilateral symmetry
    D) cephalization
    E) embryos
    b
  9. 9) Which statement is most consistent with the hypothesis that the
    Cambrian explosion was caused by the rise of predator-prey
    relationships?
    A) increased incidence of worm burrows in the fossil record
    B) increased incidence of larger animals in the fossil record
    C) increased incidence of organic material in the fossil record
    D) increased incidence of fern galls in the fossil record
    E) increased incidence of hard parts in the fossil record
    e
  10. 10) Which of the following genetic processes may be most helpful in accounting for the Cambrian explosion?
    A) binary fission
    B) mitosis
    C) random segregation
    D) gene duplication
    E) chromosomal condensation
    d
  11. 11) Whatever its ultimate cause(s), the Cambrian explosion is a prime example of
    A) mass extinction.
    B) evolutionary stasis.
    C) adaptive radiation.
    D) All three of the responses are correct.
    E) Only two of the responses are correct.
    c
  12. 12) Fossil evidence indicates that the following events occurred in what sequence, from earliest to most recent?
    1. Protostomes invade terrestrial environments.
    2. Cambrian explosion occurs.
    3. Deuterostomes invade terrestrial environments.
    4. Vertebrates become top predators in the seas.
    A) 2 → 4 → 3 → 1
    B) 2 → 1 → 4 → 3
    C) 2 → 4 → 1 → 3
    D) 2 → 3 → 1 → 4
    E) 2 → 1 → 3 → 4
    c
  13. 13) What is the probable sequence in which the following clades of animals originated, from earliest to most recent?
    1. tetrapods
    2. vertebrates
    3. deuterostomes
    4. amniotes
    5. bilaterians
    A) 5 → 3 → 2 → 4 → 1
    B) 5 → 3 → 2 → 1 → 4
    C) 5 → 3 → 4 → 2 → 1
    D) 3 → 5 → 4 → 2 → 1
    E) 3 → 5 → 2 → 1 → 4
    b
  14. 4) Arthropods invaded land about 100 million years before vertebrates did so. This most clearly implies that
    A) arthropods evolved before vertebrates did.
    B) extant terrestrial arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates.
    C) ancestral arthropods must have been poorly adapted to aquatic life, and thus experienced a selective pressure to invade land.
    D) vertebrates evolved from arthropods.
    E) arthropods have had more time to coevolve with land plants than have vertebrates.
    e
  15. 15) An adult animal that possesses bilateral symmetry is most certainly also
    A) triploblastic.
    B) a deuterostome.
    C) eucoelomate.
    D) highly cephalized.
    a
  16. 16) Soon after the coelom begins to form, a researcher injects a dye
    into the coelom of a deuterostome embryo. Initially, the dye should be
    able to flow directly into the
    A) blastopore.
    B) blastocoel.
    C) archenteron.
    D) pseudocoelom.
    c
  17. 17) A researcher is trying to construct a molecular-based phylogeny of
    the entire animal kingdom. Assuming that none of the following genes is
    absolutely conserved, which of the following would be the best choice on
    which to base the phylogeny?
    A) genes involved in chitin synthesis
    B) collagen genes
    C) β-catenin genes
    D) genes involved in eye-lens synthesis
    E) genes that cause radial body symmetry
    b
  18. 18) At which developmental stage should one be able to first distinguish a diploblastic embryo from a triploblastic embryo?
    A) fertilization
    B) cleavage
    C) gastrulation
    D) coelom formation
    E) metamorphosis
    c
  19. 19) At which developmental stage should one be able to first distinguish a protostome embryo from a deuterostome embryo?
    A) fertilization
    B) cleavage
    C) gastrulation
    D) coelom formation
    E) metamorphosis
    b
  20. 20) 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.
    E) have a gut that lacks suspension within the body cavity, whereas
    pseudocoelomates have mesenteries that hold the digestive system in
    place.
    c
  21. 21) You have before you a living organism, which you examine carefully.
    Which of the following should convince you that the organism is
    acoelomate?
    A) It is triploblastic.
    B) It has bilateral symmetry.
    C) It possesses sensory structures at its anterior end.
    D) Muscular activity of its digestive system distorts the body wall.
    d
  22. 22) The blastopore is a structure that first becomes evident during
    A) fertilization.
    B) gastrulation.
    C) the eight-cell stage of the embryo.
    D) coelom formation.
    E) cleavage.
    b
  23. 23) The blastopore denotes the presence of an endoderm-lined cavity in the developing embryo, a cavity that is known as the
    A) archenteron.
    B) blastula.
    C) coelom.
    D) germ layer.
    E) blastocoel.
    A
  24. 24) Which of the following is descriptive of protostomes?
    A) spiral and indeterminate cleavage, blastopore becomes mouth
    B) spiral and determinate cleavage, blastopore becomes mouth
    C) spiral and determinate cleavage, blastopore becomes anus
    D) radial and determinate cleavage, blastopore becomes anus
    E) radial and determinate cleavage, blastopore becomes mouth
    B
  25. 25) Which of the following characteristics generally applies to protostome development?
    A) radial cleavage
    B) determinate cleavage
    C) diploblastic embryo
    D) blastopore becomes the anus
    E) archenteron absent
    B
  26. 26) 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
    E) absence of a body cavity
    D
  27. 27) The most ancient branch point in animal phylogeny is that between having
    A) radial or bilateral symmetry.
    B) a well-defined head or no head.
    C) diploblastic or triploblastic embryos.
    D) true tissues or no tissues.
    E) a body cavity or no body cavity.
    D
  28. 28) With the current molecular-based phylogeny in mind, rank the following from most inclusive to least inclusive.
    1. ecdysozoan
    2. protostome
    3. eumetazoan
    4. triploblastic
    A) 4, 2, 3, 1
    B) 4, 3, 1, 2
    C) 3, 4, 1, 2
    D) 3, 4, 2, 1
    E) 4, 3, 2, 1
    D
  29. 29) What does recent evidence from molecular systematics reveal about the relationship between grades and clades?
    A) There is no relationship.
    B) Some, but not all, grades reflect evolutionary relatedness.
    C) Grades have their basis in, and flow from, clades.
    D) Each branch point on a phylogenetic tree is associated with the evolution of a new grade.
    B
  30. 30) Phylogenetic trees are best described as
    A) true and inerrant statements about evolutionary relationships.
    B) hypothetical portrayals of evolutionary relationships.
    C) the most accurate representations possible of genetic relationships among taxa.
    D) theories of evolution.
    E) the closest things to absolute certainty that modern systematics can produce.
    B
  31. 31) According to the evidence collected so far, the animal kingdom is
    A) monophyletic.
    B) paraphyletic.
    C) polyphyletic.
    D) euphyletic.
    E) multiphyletic.
    A
  32. 32) If a multicellular animal lacks true tissues, then it can properly be included among the
    A) eumetazoans.
    B) metazoans.
    C) choanoflagellates.
    D) lophotrochozoans.
    E) bilateria.
    B
  33. 33) Which of the following statements concerning animal taxonomy is (are) true?
    1. Animals are more closely related to plants than to fungi.
    2. All animal clades based on body plan have been found to be incorrect.
    3. Kingdom Animalia is monophyletic.
    4. Only animals reproduce by sexual means.
    5. Animals are thought to have evolved from flagellated protists similar to modern choanoflagellates.
    A) 5 only
    B) 1 and 3
    C) 3 and 5
    D) 3, 4, and 5
    C
  34. 34) If the current molecular evidence regarding animal origins is
    well-substantiated in the future, then what will be true of any contrary
    evidence regarding the origin of animals derived from the fossil
    record?
    A) The contrary fossil evidence will be seen as a hoax.
    B) The fossil evidence will be understood to have been incorrect because it is incomplete.
    C) The fossil record will henceforth be ignored.
    D) Phylogenies involving even the smallest bit of fossil evidence will need to be discarded.
    E) Only phylogenies based solely on fossil evidence will need to be discarded.
    B
  35. 35) What is true of the clade Ecdysozoa?
    A) It includes all animals that molt at some time during their lives.
    B) It includes all animals that undergo metamorphosis at some time during their lives.
    C) It includes all animals that have body cavities known as pseudocoeloms.
    D) It includes all animals with genetic similarities that are shared with no other animals.
    E) It includes all animals in the former clade Protostomia that truly do have protostome development.
    D
  36. 36) Which distinction is given more emphasis by the morphological phylogeny than by the molecular phylogeny?
    A) metazoan and eumetazoan
    B) radial and bilateral
    C) true coelom and pseudocoelom
    D) protostome and deuterostome
    E) molting and lack of molting
    D
  37. 37) The last common
    ancestor of all bilaterians is thought to have had four Hox genes. Most
    extant cnidarians have two Hox genes, except Nematostella (of β-catenin
    fame), which has three Hox genes. On the basis of these observations,
    some have proposed that the ancestral cnidarians were originally
    bilateral and, in stages, lost Hox genes from their genomes. If true,
    this would mean that
    A) Radiata should be a true clade.
    B) the radial symmetry of extant cnidarians is secondarily derived, rather than being an ancestral trait.
    C) Hox genes play little actual role in coding for an animal's "body plan."
    D) Cnidaria may someday replace Acoela as the basal bilaterians.
    E) Two of the responses above are correct.
    E
  38. Both Sides










    38) Which of these, if true, would support the claim that the ancestral cnidarians had bilateral symmetry?
    1. Cnidarian larvae possess anterior-posterior, left-right, and dorsal-ventral aspects.
    2. Cnidarians have fewer Hox genes than bilaterians.
    3. All extant cnidarians, including Nematostella, are diploblastic.
    4. β-catenin turns out to be essential for gastrulation in all animals in which it occurs.
    5. All cnidarians are acoelomate.
    A) 1 only
    B) 1 and 4
    C) 2 and 3
    D) 2 and 4
    E) 4 and 5
    B
  39. 39) Some researchers claim that sponge genomes have homeotic genes, but no Hox genes. If true, this finding would
    A) strengthen sponges' evolutionary ties to the Eumetazoa.
    B) mean that sponges must no longer be classified as animals.
    C) confirm the identity of sponges as "basal animals."
    D) mean that extinct sponges must have been the last common ancestor of animals and fungi.
    E) require sponges to be reclassified as choanoflagellates
    C
  40. Both Sides










    50) Cycliophorans
    have two types of larvae. One type of larvathe Prometheus
    larvadevelops into a male. The male, which lacks a digestive system,
    attaches to the outside of a feeding stage (a female) and impregnates
    her digestive system, which develops into a different type of larva.
    What must be true of the digestive system of the feeding-stage female
    while she is still a virgin?
    1. At least some of its cells are haploid.
    2. It consists only of highly specialized cells.
    3. It is the same size as the male.
    A) 1 only
    B) 2 only
    C) 3 only
    D) 1 and 3
    E) 2 and 3
    A
  41. Trichoplax adhaerens (Tp) is the only living species in the phylum
    Placozoa. Individuals are about 1 mm wide and only 27 μm high, are
    irregularly shaped, and consist of a total of about 2,000 cells, which
    are diploid (2n = 12). There are four types of cells, none of which are
    nerve or muscle cells, and none of which have cell walls. They move
    using cilia, and any "edge" can lead. Tp feeds on marine microbes,
    mostly unicellular green algae, by crawling atop the algae and trapping
    it between its ventral surface and the substrate. Enzymes are then
    secreted onto the algae, and the resulting nutrients are absorbed. Tp
    sperm cells have never been observed, nor have embryos past the 64-cell
    (blastula) stage.
    51) If Tp sperm are observed by future researchers, how many chromosomes should be found in a Tp sperm nucleus?
    A) 2
    B) 3
    C) 6
    D) 12
    C
  42. Trichoplax adhaerens (Tp) is the only living species in the phylum
    Placozoa. Individuals are about 1 mm wide and only 27 μm high, are
    irregularly shaped, and consist of a total of about 2,000 cells, which
    are diploid (2n = 12). There are four types of cells, none of which are
    nerve or muscle cells, and none of which have cell walls. They move
    using cilia, and any "edge" can lead. Tp feeds on marine microbes,
    mostly unicellular green algae, by crawling atop the algae and trapping
    it between its ventral surface and the substrate. Enzymes are then
    secreted onto the algae, and the resulting nutrients are absorbed. Tp
    sperm cells have never been observed, nor have embryos past the 64-cell
    (blastula) stage.
    52) In how many of the following ways is Tp unlike the typical animal?
    1. Tp is multicellular.
    2. Tp lacks muscle and nerve cells.
    3. Tp has cilia.
    4. Tp has a different place where digestion of food occurs.
    5. Tp lacks cell walls.
    A) only one way
    B) two ways
    C) three ways
    D) four ways
    E) all five ways
    B
  43. Trichoplax
    adhaerens (Tp) is the only living species in the phylum Placozoa.
    Individuals are about 1 mm wide and only 27 μm high, are irregularly
    shaped, and consist of a total of about 2,000 cells, which are diploid
    (2n = 12). There are four types of cells, none of which are nerve or
    muscle cells, and none of which have cell walls. They move using cilia,
    and any "edge" can lead. Tp feeds on marine microbes, mostly unicellular
    green algae, by crawling atop the algae and trapping it between its
    ventral surface and the substrate. Enzymes are then secreted onto the
    algae, and the resulting nutrients are absorbed. Tp sperm cells have
    never been observed, nor have embryos past the 64-cell (blastula) stage.
    53) On the basis of information in the previous paragraph, which of these should be able to be observed in Tp?
    A) the act of fertilization
    B) the process of gastrulation
    C) eggs
    D) All three of the responses above are correct.
    E) Two of the responses above are correct.
    C
  44. Trichoplax adhaerens (Tp)
    is the only living species in the phylum Placozoa. Individuals are
    about 1 mm wide and only 27 μm high, are irregularly shaped, and consist
    of a total of about 2,000 cells, which are diploid (2n = 12). There
    are four types of cells, none of which are nerve or muscle cells, and
    none of which have cell walls. They move using cilia, and any "edge" can
    lead. Tp feeds on marine microbes, mostly unicellular green algae, by
    crawling atop the algae and trapping it between its ventral surface and
    the substrate. Enzymes are then secreted onto the algae, and the
    resulting nutrients are absorbed. Tp sperm cells have never been
    observed, nor have embryos past the 64-cell (blastula) stage.
    54) In its native environment, a Tp cell neither gains nor loses
    water. What should one expect to occur when Tp is placed into fresh
    water?
    A) no change from the above, as fresh water is its native environment
    B) lysis
    C) plasmolysis
    D) slight shrinkage
    B
  45. Trichoplax adhaerens (Tp) is the only living species in the phylum
    Placozoa. Individuals are about 1 mm wide and only 27 μm high, are
    irregularly shaped, and consist of a total of about 2,000 cells, which
    are diploid (2n = 12). There are four types of cells, none of which are
    nerve or muscle cells, and none of which have cell walls. They move
    using cilia, and any "edge" can lead. Tp feeds on marine microbes,
    mostly unicellular green algae, by crawling atop the algae and trapping
    it between its ventral surface and the substrate. Enzymes are then
    secreted onto the algae, and the resulting nutrients are absorbed. Tp
    sperm cells have never been observed, nor have embryos past the 64-cell
    (blastula) stage.
    55) Tp's body symmetry seems to be most like that of
    A) most sponges.
    B) cnidarians.
    C) worms.
    D) tetrapods.
    E) Two of the responses above are correct.
    A
  46. Trichoplax adhaerens (Tp) is the only living species in the phylum
    Placozoa. Individuals are about 1 mm wide and only 27 μm high, are
    irregularly shaped, and consist of a total of about 2,000 cells, which
    are diploid (2n = 12). There are four types of cells, none of which are
    nerve or muscle cells, and none of which have cell walls. They move
    using cilia, and any "edge" can lead. Tp feeds on marine microbes,
    mostly unicellular green algae, by crawling atop the algae and trapping
    it between its ventral surface and the substrate. Enzymes are then
    secreted onto the algae, and the resulting nutrients are absorbed. Tp
    sperm cells have never been observed, nor have embryos past the 64-cell
    (blastula) stage.
    56) In an experiment, several Tp individuals were stained
    different colors. The stained individuals were then passed through a
    strainer, disaggregated to the level of single cells, and collected into
    a common container of seawater. Which subsequent finding would be most
    surprising if the Tp individuals used in this experiment had been
    produced by sexual, rather than asexual, means?
    A) If all of the cells from a given individual reaggregated to form
    the same individual, and if each cell had retained its original
    identity, as far as cell type goes.
    B) If all of the cells from a given individual reaggregated to form
    the same individual, but if each cell had a different identity than it
    had before disaggregation.
    C) If cells from different original individuals reaggregated together to form new individual organisms.
    D) If cells from different original individuals reaggregated together to form new species.
    C
  47. A student encounters an animal embryo at the eight-cell stage. The four
    smaller cells that comprise one hemisphere of the embryo seem to be
    rotated 45 degrees and to lie in the grooves between larger, underlying
    cells (i.e., spiral cleavage).
    57) This embryo may potentially develop into a(n)
    A) turtle.
    B) earthworm.
    C) sea star.
    D) fish.
    E) sea urchin.
    B
  48. A student encounters an animal embryo at the eight-cell stage. The four
    smaller cells that comprise one hemisphere of the embryo seem to be
    rotated 45 degrees and to lie in the grooves between larger, underlying
    cells (i.e., spiral cleavage).
    58) If we were to separate these eight cells and attempt to culture them individually, then what is most likely to happen?
    A) All eight cells will die immediately.
    B) Each cell may continue development, but only into a nonviable embryo that lacks many parts.
    C) Each cell may develop into a full-sized, normal embryo.
    D) Each cell may develop into a smaller-than-average, but otherwise normal, embryo.
    B
  49. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    59) Which of these features is least useful in assigning the phylum Cycliophora to a clade of animals?
    A) having a true coelom as a body cavity
    B) having a body symmetry that permits a U-shaped intestine
    C) having embryos with spiral cleavage
    D) lacking ecdysis (molting)
    A
  50. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    60) Basing your inferences on information in the previous paragraph, to which clade(s) should cycliophorans belong?
    1. Eumetazoa
    2. Deuterostomia
    3. Bilateria
    4. Ecdysozoa
    5. Lophotrochozoa
    A) 1 only
    B) 1 and 3
    C) 1, 3, and 5
    D) 2, 3, and 4
    E) 2, 3, and 5
    C
  51. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    61) If harboring large populations of cycliophorans neither
    helps nor harms their lobster hosts, then cycliophorans can be properly
    considered to be
    1. parasites.
    2. mutualists.
    3. commensals.
    4. symbionts.
    5. endosymbionts.
    A) 1 and 4
    B) 2 and 4
    C) 3 and 4
    D) 2 and 5
    E) 3 and 5
    C
  52. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    62) On the basis of the cleavage pattern of cycliophoran embryos, which of these should be true?
    A) It has determinate development.
    B) The blastopore becomes the anus.
    C) They are deuterostomes.
    D) A cell separated from a four-cell embryo should develop into a complete organism.
    A
  53. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    63) Using similarities in embryonic development, body symmetry,
    and other anatomical features to assign an organism to a clade involves
    1. cladistics based on body plan.
    2. molecular-based phylogeny.
    3. morphology-based phylogeny.
    A) 1 only
    B) 2 only
    C) 3 only
    D) 1 and 2
    E) 1 and 3
    E
  54. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    64) Which of these, if discovered among cycliophorans, would
    cause the most confusion concerning our current understanding of
    cycliophoran taxonomy?
    A) if the ciliated feeding ring is a lophophore
    B) if embryos are diploblastic
    C) if the body cavity is actually a pseudocoelom
    D) if the organisms show little apparent cephalization
    B
  55. The most recently discovered phylum in the animal kingdom (1995) is the
    phylum Cycliophora. It includes three species of tiny organisms that
    live in large numbers on the outsides of the mouthparts and appendages
    of lobsters. The feeding stage permanently attaches to the lobster via
    an adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    65) What is true of the feeding stage of cycliophorans?
    1. It is chemoheterotrophic.
    2. It is sessile.
    3. It captures food in a manner similar to that of animals with lophophores.
    4. It has radial symmetry.
    A) 1 and 2
    B) 1 and 3
    C) 2 and 4
    D) 1, 2, and 3
    E) 2, 3, and 4
    D
  56. he most recently
    discovered phylum in the animal kingdom (1995) is the phylum
    Cycliophora. It includes three species of tiny organisms that live in
    large numbers on the outsides of the mouthparts and appendages of
    lobsters. The feeding stage permanently attaches to the lobster via an
    adhesive disk, and collects scraps of food from its host's feeding by
    capturing the scraps in a current created by a ring of cilia. The body
    is sac-like and has a U-shaped intestine that brings the anus close to
    the mouth. Cycliophorans are eucoelomate, do not molt (though their host
    does), and their embryos undergo spiral cleavage.
    66) Cycliophorans have two types of larvae. One type of larva is
    produced when the digestive system of a female is impregnated by a
    male. The digestive system then collapses and develops into a larva,
    which swims away in search of a new host after the surrounding female
    dies. Which is the embryonic tissue that is apparently most important in
    forming this type of larva?
    A) mesohyl
    B) mesoderm
    C) ectoderm
    D) endoderm
    E) mesoglea
    D
  57. 70) Among the characteristics unique to animals is
    A) gastrulation.
    B) multicellularity.
    C) sexual reproduction.
    D) flagellated sperm.
    E) heterotrophic nutrition.
    A
  58. 71) The distinction between sponges and other animal phyla is based mainly on the absence versus the presence of
    A) a body cavity.
    B) a complete digestive tract.
    C) a circulatory system.
    D) true tissues.
    E) mesoderm.
    D
  59. 72) Acoelomates are characterized by
    A) the absence of a brain.
    B) the absence of mesoderm.
    C) deuterostome development.
    D) a coelom that is not completely lined with mesoderm.
    E) a solid body without a cavity surrounding internal organs.
    E
  60. 73) Which of the following was probably the least important factor in bringing about the Cambrian explosion?
    A) the emergence of predator-prey relationships among animals
    B) the accumulation of diverse adaptations, such as shells and different modes of locomotion
    C) the movement of animals onto land
    D) the origin of Hox genes and other genetic changes affecting the regulation of developmental genes
    E) the accumulation of sufficient atmospheric oxygen to support the more active metabolism of mobile animals
    C

What would you like to do?

Home > Flashcards > Print Preview