BIOL10005 Lecture Notes - Lecture 18: Burgess Shale, Oomycete, Purple Bacteria

• School: University of Melbourne
• Department: Biology
• Course: BIOL10005
• Professor: Dawn Gleeson

Document Summary

Origin of the nuclear membrane -> endoplasmic reticulum. During nuclear division, nuclear envelope disintegrates -> after chromosomes divide & separate, er clusters around the chromosomes -> new er formed. Mitochondria has its own membrane & dna. Primary endosymbiosis: host cell invaginates a purple bacteria -> some of the genetic (cid:373)aterial fro(cid:373) purple (cid:271)a(cid:272)teria is tra(cid:374)sferred to the host(cid:859)s ge(cid:374)o(cid:373)e. First eukaryotic cell appeared 1. 4 billion years ago. Burgess shale animals 508 mya (cambrian) Absorbers & recyclers: li(cid:373)e (cid:373)oulds, (cid:449)ater (cid:373)oulds, . Paraphyletic group is characterized by not having a shared derived character e. g. ) A and b do not have characteristic (cid:858)3(cid:859) -> (cid:858)rest of the group(cid:859) (cid:449)he(cid:374) (cid:455)ou take out a certain characteristic from all. Eukaryotes when taking out plants, fungi and animals. Paulinella, galucophyta, rhodophyta all have the same pigments as cyanobacteria (chl a, phycocyanin, phycoerythrin) Chlorophyta (land plants) have chl a & b. Secondary symbiosis: engulfed endosymbiont is an eukaryotic cell -> resulted in enormous di(cid:448)ersit(cid:455) (cid:862)protista(cid:374) pirates(cid:863)