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10 Cards in this Set
- Front
- Back
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3. Define an animal?
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Heterotrohpic, multicellular eukaryotes, w/ tissue developing from embryonic layers
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4. Breakdown your definition of an animal and define the components.
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Heterotrophic: obtain organic molecules
Multicellular: multiple cells engaged in serving dif. Functions Embryonic: cleavage- mitotic cell division w/out cell growth, forms blastula; multicellular embryo then differentiates; gastrulation occurs |
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6. How is multicellular different from coloniality?
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multicellular: multiple cells engaged in serving dif functions, nutrients passed from feeding to non-feeding cells.
coloniality ea. Cell feeds itself |
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7. What is extracellular matrix and what does it do?
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structural proteins contained here
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8. What are the three types of cell junctions in animals and what do they do?
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Tight Junctions: maintains separation
Desmosomes: rivets holding cell together Gap Junctions: communication pores |
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10. Describe basic animal development after fertilization up to the formation of the gastrula?
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multicellular --> zygote --> cleavage --> blastula --> embryo differentiates --> gastrulation
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12. What are Hox genes?
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regulate development/ catalyst
Homeotic genes in animals that contain a homeobox sequence which regulate developmental genes |
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13. When did animals come into existence? Give me more than one possibility.
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1.5 bya-800 mya / Edicaran Fauna
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14. What is the Cambrian Explosion?
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animals found on land in large amounts.
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15. What were the major events in these eras in terms of animal evolution?
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- Neoproterozoic -- first fossil animals
- Paleozoic – Cambrian explosion, inc in O2, evolution of Hox genes, inc in predator/prey - Mesozoic Era -- great diversification - Cenozoic Era – meteor hits, plants/ insects diversify, mammals too |
