Exam 1 review

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21 Terms

1
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Why protist are not metazoans

Protist are primarily unicellular organism

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Challenges animals face in marine habitats

Climate change, pollution, and habitat loss

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Challenges animals face in freshwater habitats

Unstable, changes occur often, smaller so influenced by extrinsic environmental factors

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Challenges animals face in terrestrial habitats

Extreme temperature and water balance

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What is used to construct phylogenetic trees

morphological (body shape), biochemical, behavioral, or molecular features of species or other groups. Then grouped by relationships among them

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Protostomia

Have mouth forming first

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Deuterostomia

Anus forming first

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Spiralia

Undergo spiral cleavage

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Ecdysozoa

All capable of molting

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Echinodermata

5 radial symmetry

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Hemichordata

Worm-like body, bilaterally symmetry and triploblastic in nature

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Chordata

notochord and post anal tail

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Saxitoxins

neurotoxins that cause paralytic shellfish poisoning

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ribotoxins

fungal ribonuclease

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Cephalization

Concentration of nerve tissue and sensory organs at the anterior end of an animal, creating a head region. ( encounter head first) Bilateral symmetry.

ex: Birds, snakes, lobsters, ants

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Radial cleavage

Simple pattern of cell division that occurs in early embryonic development

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Spiral cleavage

pattern of cell division that occur in flat and earthworm, snail

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Acoelomate

organisms that have no true body cavities between the layers of their tissues

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Pseudocoelomate

they have a body cavity, but it is not lined with mesoderm.

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Eucoelomate

true body cavity