01:119:115 Lecture Notes - Lecture 3: Giardia Lamblia, Symbiogenesis, Excavata
8 Jul 2015
School
Department
Course
Professor
Document Summary
Classification of eukaryotes is continuously revised as new (molecular) data emerges. Clear differences exist between eukaryotes vs prokaryotes: eukaryotes have nucleus and other membrane bound organelles, cells have well developed cytoskeleton, cytoskeleton provides structural support that allows: Allows change of shape for feeding, moving, growing. Root of eukaryotic tree is not clearly known: supergroup excavata, supergroup sar clade, supergroup archaeplastida, supergroup unikonta. Groups formerly in kingdom protista now scattered across domain eukaryotes. Protists are a structurally and functionally diverse group. Most single-celled (but some colonial and multicellular: single-cell does not imply simplicity. Do same functionas as multicellular organisms, but with sub-cellular organelles (e. g. er, golgi, lysosomes, nucleus) Means of reproduction also very diverse: asexual (binary fission, sexual (all 3 major types and some variations of these figure 13. 6) Diversity that exist among protists has origins in endosymbiosis: recall endosymbiotic theory. Early eukaryotes engulfed aerobic prokaryote: some alpha-proteobacteria became mitochondria.
