BIOL 1202 Chapter : Chapter 28 Protists
Document Summary
Concept 28. 1: most eukaryotes are single-celled organisms: protists are more diverse than all other eukaryotes, no longer considered a single kingdom, mostly unicellular, but some colonial and multicellular forms. Protists are nutritionally diverse: photoautotrophs, contain chloroplasts, photosynthesize, heterotrophs, absorb organic molecules or ingest larger particles, mixotrophs, combine photosynthesis & heterotrophic nutrition. Endosymbiosis in eukaryotic evolution: much protist diversity has its origin in endosymbiosis, plastid-bearing lineage evolved into red and green algae, both underwent secondary endosymbiosis, figure 28. 2. Motility in protists: flagellates: move by 1 or more flagellae, ciliates: move by coordinated movement of cilia, amoebae: move by means of pseudopodia, figure 28. 7. Protists have a wide variety of life histories: zygotic life cycle: haploid cells transform into gametes, gametes fuse to form zygotes (e. g. plasmodium, which causes malaria, alternation of generations: produce 2 types of multicellular organisms (n and. 2n); many algae and all land plants: figures 28. 10 & 28. 16.
