BIOL165 Lecture Notes - Lecture 7: Nuclear Membrane, Rhizaria, Unikont

• School: University of Waterloo
• Department: Biology
• Course: BIOL165
• Professor: Marcel Pinheiro

Document Summary

We do(cid:374)"t k(cid:374)o(cid:449) if that origi(cid:374)al (cid:272)ya(cid:374)o(cid:271)a(cid:272)teria es(cid:272)aped the (cid:448)esi(cid:272)le or sur(cid:448)i(cid:448)ed a(cid:374)d proliferated inside. Chloroplast i(cid:374)(cid:374)er (cid:373)e(cid:373)(cid:271)ra(cid:374)e (cid:272)a(cid:373)e fro(cid:373) (cid:272)ya(cid:374)o(cid:271)a(cid:272)teria (cid:271)ut do(cid:374)"t k(cid:374)o(cid:449) outer (cid:373)e(cid:373)(cid:271)ra(cid:374)e. Changed physiology of the cell till the point it became an organelle, could have changed. Important for host cell to survive so swapped genes through horizontal gene transfer the membrane of the cells. Primary endosymbiosis escaped from phagosome and membranes probably bacterial in origin. Secondary endosymbiosis where bigger cell engulfed the smaller cell and now has photosynthetic cell. Result of secondary endosymbiosis is present photosynthetic cells. Algae is not a taxonomic level, it is a catch term for photosynthetic organisms that are. Lynn margulis proposed the endosymbiosis theory not plants! Chloroplasts are the result of primary, secondary, and tertiary endosymbiotic events. In algae, cyanobacteria were assimilated into 1 or two host phylads and evolved into chloroplasts.