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theory of endosymbiosys

저작시기 2007.03 |등록일 2008.02.20 파워포인트파일MS 파워포인트 (ppt) | 5페이지 | 가격 1,000원

소개글

Mitochondria and chloroplasts are thought to have evolved from symbiotic bacteria present in nucleated cells. the experimental evidence that supports this hypothesis.

목차

Question 12
Theory of Endosymbiosis
Evidence for the endosymbiont theory
Molecular Evidence for Endosymbiosis

본문내용

Lynn Margulis championed the Endosymbiotic Hypothesis, which held that eukaryotic mitochondria and chloroplasts were
originally prokaryotes - first presented this idea in 1981

An ancient, anaerobic eukaryote engulfed an aerobic eubacterium(alpha proteobacteria) mitochondrion -Aerobic respiration yields way more ATP (=cellular energy) than less efficient anaerobic respiration

Chloroplast(originated from cyanobacteria) – organelle responsible for photosynthesis
Traps the energy of light, uses it to energize electrons and rip them off of H2O
Drives carbon fixation, converting CO2 into organic, high-energy compounds (sugars)

The prokaryotic ancestors of mitochondria and plastids probably gained entry to the host cell as undigested prey or internal parasites
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