bio notes 3-7

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Anonymous
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148221
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bio notes 3-7
Updated:
2012-04-17 18:13:47
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bio notes test #3 characteristics of animals
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  1. - multicellular, heterotrophic eukaryotes
    - ingest food and digest internally
    - cells lack cell walls
    - unique cell junctions
    - collagen and proteoglycans in extracellular matrix
    -most have tissues
    -most capable of movement
    -reproduce sexually
    - haploid sperm fertilizes larger nonmotile haploid egg, forms diploid zygote
    -embryonic development regulated by Hox genes; includes cleavage and gastrulation
    characteristics of animals
  2. what regulates embryonic development in animals?
    Hox genes, includes cleavage and gastrulation
  3. what is in the extracellular matrix of animals?
    collagen and proteoglycans
  4. what is a rapid cell division with no growth of cells between the division?
    cleavage
  5. what is the solid ball of cells in cleavage?
    morula
  6. what does "coel" mean?
    cavity
  7. what is the hollow ball of cells?
    blastula
  8. what is the formation of germ layers?
    gastrulation
  9. what is the cavity formed in the blastula?
    archenteron
  10. what are the 2 major groups of triploblastic animals?
    protostomes and deuterostomes
  11. in what animal do no germ layers or tissues develop?
    sponges
  12. what are the 3 types of symmetry in animals?
    asymmetrical, radial, bilateral
  13. what types of animals are asymmetrical?
    placozoans and many sponges
  14. what symmetry cuts any plane along main body axis and divides the animal into similar halves?
    radial
  15. 3 examples of animals with radial symmetry?
    cnidarians, ctenophores, echinoderms
  16. what type of symmetry has only 1 plane through anterior- posterior midline divides animal into mirror image halves?
    bilateral symmetry
  17. which type of symmetry is strongly correlated with cephalization?
    bilateral
  18. where are the body cavities located?
    they are a fluid filled cavity between the digestive tract and outer body wall
  19. 3 types of body cavities?
    Acoelomate, Pseuodocoelomate, Coelomate
  20. what has no fluid- filled body cavity?
    acoelomate
  21. what is an example of Acoelomate?
    solid mesenchyme flatworm
  22. what is a fluid filled cavity that lies between the mesoderm and endoderm?
    pseudocoelomate
  23. what is an example of Pseudocoelomate?
    rotifers and nematodes
  24. what is a fluid filled body cavity enclosed completely within the mesoderm?
    coelomate
  25. examples of coelomate?
    ectoprocts, nemerteans, phoronids, brachiopods, annelids, mollusks, and arthropods
  26. what are 2 functions of the body cavities?
    cushions suspend organs, acts as hydrostatic skeleton against which muscles can work (soft bodied animals)
  27. What improves control of movement and may not be apparent externally?
    body segmentation
  28. what are the external appendages specialized for?
    • -locomotion
    • -capturing prey
    • -chewing food
    • -sensing environment
  29. what are 2 feeding strategies used by animals?
    filter feeders, herbivores
  30. what filters small organisms and organic molecules from their environment, may be motile or sessile
    filter feeders
  31. what are some examples of filter feeders?
    christmas tree worm, sponge, flamingo, baleen whale
  32. what feeds on plants; usually have long, complex guts
    herbivores

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