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Unformatted text preview: 6-18-09Lecture 7Eukaryote Diversity**What may have promoted the origin of eukaryotes?A. Pressure for greater metabolic flexB. Colonize new habitatsC. Competition between groupsD. Opprotunities for more structural complexitySerial Endosymbiosis-Prokaryotes working together-Plasma membrane invaginates (enfolds)provides more surface area for other processesmore internal compartements for processes with nuclear envelopeendoplasmic recticulum-Prokaryotic cells enclosed (engulfed)mitochondrion function definedcellular respirationchloroplast function defined in plantsphotosynthesis-evidencemitocondrian and choloroplast have own DNAlack histonesorganelles reproduce by binary fission-like processorganelle ribosomes like bacterial onesDiversity in the early years, the base of this tree is unknown-Unikonts ~animals and fungi-Archaeplastida ~ land plants, algae-Rhizaria-Chromalveolata-ExcavataRecent groups have well defined boundries (Plants, Fungi, Animals)however groups with the longest history are not well known (protists)...
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- Spring '10