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10 Cards in this Set
- Front
- Back
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Explain why the kingdom Protista is no longer considered a legitimate taxon.
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Some protists are more closely related to plants, fungi, or animals that they are to other protists
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Describe the different nutritional strategies of protists.
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Photoautotrophy, heterotrophy, mixatrophy.
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Describe the evidence that supports the theory that mitochondria and plastids evolved by serial endosymbiosis.
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Mitochondria and plastids originated as seperate prokaryotic organisms which were taken inside the cell as endosymbiotic.
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Describe the evidence that suggests that mitochondria were acquired before plastids in eukaryotic evolution.
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The early orgin of mitochondria is supported by the fact that all eukaryotes studied so far either have mitochondria or show signs that their ancestors had them.
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Explain the role of secondary endosymbiosis in the evolution of red and green algae.
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Secondary endosymbios- A process in eukaryotic evolution in which a heterotrophic eukaryotic cell engulfed a photosynthetic eukaryotic cell, which survived in a symbiotic relationship inside the heterotrophic cell.
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Name the five “supergroups” of eukaryotes. Which supergroups include multicellular kingdoms?
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Archaeplastida
Chromalvelota Excavata Rhizaria Unikonta |
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Explain the basis for the proposal for a new “plant” kingdom, Viridiplantae.
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green algae and land plants are closely related. phylogenetically, this change makes sense, otherwise the green algae are a paraphyletic group.
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Describe three mechanisms by which large size and complexity have evolved in chlorophytes.
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1) the formation of colonies of individual cells that contribute to the stringy masses know as pond scum.
2) The formation of true multicellular bodies by cell division and differentiation. 3) the repeated division of nuclei with no cytoplasmic division |
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Describe an ecologically significant symbiosis involving a protist partner.
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Photosynthetic dinoflagellates provide nurishment to their symbiotic partner, the coral polyps that build coral reefs. protists provide the essentail source of energy.
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Explain the significance of primary production by protists in aquatic communities.
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Producers- organisms that use energy from light to convert CO2 to organic compounds. They are the base of the food web.
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