BIOL 2200 Lecture Notes - Lecture 15: Mycorrhiza, Mycelium, Motility

• School: University of Virginia
• Department: Biology
• Course: BIOL 2200
• Professor: Jessamyn Manson

Document Summary

4 supergroups of eukaryotes: polytomy unresolved groups, common ancestors unknown. Eukaryotes: nucleus and membrane-enclosed organelles, key innovations: Endosymbiosis appearance of mitochondria and chloroplasts. Multicellularity: *** most eukaryotic lineages are protists and most protists are unicellular. Endosymbiosis revisited: mitochondria came before chloroplasts, all mitochondria have a common ancestor, likely an archaean, chloroplasts originated from cyanobacteria, plastid diversity is due to secondary endosymbiosis, plastid general term for double-membraned organelles that make/store compounds. Protists: used to (cid:271)e a ki(cid:374)gdo(cid:373), (cid:374)o(cid:449) it"s a (cid:271)u(cid:374)(cid:272)h of (cid:448)ery differe(cid:374)t orga(cid:374)is(cid:373)s (cid:272)lu(cid:373)ped together, few general traits since they are so diverse. Diatoms: photosynthetic unicellular algae (photoautotrophs, silicon walls that refract light, bloom under high nutrient conditions, represent a carbon sink on the ocean floor, amy be a tool for reduced global warming. Dinoflagellates: alveoli add to cell structure, 2 flagella make them spin as they move through water, heterotrophs, phototrophs, autotrophs, red tide water appears red due to carotenoids, toxins lead to fish kills.