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The theory of endosymbiosis

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  • Essay length: 1726 words
  • Submitted: 15/12/2002
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AS and A Level Molecules & Cells

The first 200 words of this essay...

The theory of endosymbiosis

(Endo Within, Symbiosis Living together! )

I am going to analyze the theory of endosymbiosis over the next few pages. I am going to give

arguments for and against so I can make a reliable conclusion. First of all I am going to give

some information about the theory of endosymbiosis. According to the theory of

endosymbiosis, billions of years ago mitochondria and chloroplasts were free-living bacteria

(prokaryotes) which somehow became part of an early cell. The primitive Earth did not have

oxygen in its atmosphere so these early cells must have been able to survive with out oxygen.

However, oxygen gradually oxygen built up in the atmosphere and it is possible that some

bacteria evolved which were able to use oxygen for respiration (aerobic bacteria). According

to the theory, an aerobic bacterium became engulfed by an anarobic amoeba-like bacterium,

and the amoeba-like bacterium navigated through the newly oxygen rich waters in search of

food. In support of this theory of endosymbiosis, scientists have shown that oxygen began to

accumulate between the

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