BIOL-UA 11 Chapter Notes -Green Algae, Red Algae, Nucleomorph
Document Summary
Organisms in most eukaryotic lineages are protists. Most structurally and functionally diverse group of eukaryotes. Nutritionally diverse - photoautotrophs, heterotrophs, and mixotrophs (photosynthetic and heterotrophic nutrition) Nutritional modes have risen independently in many protist lineages. All three basic types of sexual life cycles, along with some variations, are represented. Endosymbiosis - the process in which unicellular organisms engulf other cells, which become endosymbionts and ultimately organelles in the host cell. Evidence shows that much of protist diversity has its origins in endosymbiosis. Plastids were introduced when a heterotrophic eukaryotes acquired a photosynthetic cyanobacterium that then evolved into plastids. This lineage gave rise to two lineages of algae (photosynthetic protists): red algae and green algae. Dna of plastid genes in red algae and green algae closely resembles the. Plastids in red algae and green algae are surrounded by two membranes; transport proteins in these membranes are homologous to proteins in the inner and outer membranes of cyanobacterial endosymbionts.
