Lecture 30-Endosymbiosis

Lecture 30-Endosymbiosis - Lecture 30- Endosymbiosis -The...

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Lecture 30- Endosymbiosis -The theory: mitochondria and chloroplasts were once free living prokaryotes, and one prokaryote engulfed the organelles -Occurred over evolutionary time; started with infolding membrane, the cynobacteria engulfed the aerobic prokaryotes Evidence for Endosymbiosis 1) Morphology -What it looks like, shape… -They look similar (internal membrane, structures, size) 2) Formation/Division -How mitochondria and chloroplasts divide (binary fission) is similar to how bacteria divide -Never made “de novo” (from nothing) 3) Electron transport -Only occurs in mitochondria and chloroplasts 4) Possess their own genomes *** -Prediction of endosymbiosis -Single, circular chromosome, lack histones 5) Possess protein -Synthesising machinery -Ribosomes similar to bacteria What Drove the Evolution of Prokaryotes? -The earliest prokaryotes were anaerobic (they ferment, use glycolysis, but do not use oxidative phosphorylation) -2.2 billion years ago, cynobacteria evolved the ability to break water (called oxygenic
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This note was uploaded on 04/04/2009 for the course BIOLOGY 1222 taught by Professor Haffie during the Spring '09 term at UWO.

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Lecture 30-Endosymbiosis - Lecture 30- Endosymbiosis -The...

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