Exam II - #8 and #10 : Plant-like protists (Algae) How are...

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#8 and #10 : Plant-like protists (Algae) How are protists defined – very diverse Nutritionally – all trophs except for chemoautotrophic Organization – unicellular, filamentous, colonial, multicellular Habitat – all different kinds Reproduction – asexual or sexual Life Cycle – Diplobiontic, with sproric meiosis Haplobiontic, haploid, with zygotic meiosis Haplobiontic, diploid, with gametic meiosis Plant-like protists are NOT monophyletic (having one evolutionary root) Algae are plant-like because they are eukaryotic, photoautotrophic, and have an alternation of generations lifecycle (diplobiontic) Different because they are almost exclusively aquatic, lack multicellular sex organs, and lack true vascular tissue (xylem and phloem) Pigments are used by photoautotrophy to absorb light. They are stored in the plastids. Accessory pigments extend the range of light absorbed beyond what the primary pigments do. Phylum Organization Pigment Storage Prod. Cell Wall Chlorophyta Green Algae Unicellular filamentous colonial Chlorophyll a and b Starch Mainly cellulose Phaeophyta Brown Algae Filamentous multicellular a, c, fucoxanthin Laminarin, mannitol, lipids Cellulose, alginates Rhodophyta Red Algae Multicellular Phycobilins Modified starch Cellulose, agar,
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Exam II - #8 and #10 : Plant-like protists (Algae) How are...

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