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Changes In The Atmosphere Causing Multicellularity - School Essays

Changes In The Atmosphere Causing Multicellularity

About 2.5 billion years ago, oxygen began slowly to accumulate in the
atmosphere, as a result of the photosynthetic activity of the cyanobacteria.
Those prokaryotes that were able to use oxygen in ATP production gained a strong
advantage, and so they began to prosper and increase. Some of these cells may
have evolved into modern forms of aerobic bacteria. Other cells may have become
symbionts with larger cells and evolved into mitochondria. As the amount of
oxygen and other atmospheric gasses increased, they started blocking out deadly
u.v. rays from the sun. The sun’s rays made life outside of water nearly
impossible. These changes made life on land possible and evolution occurred ...

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such as the protists
evolved from the prokaryotes. There are two main theories which describe how
this transition may have occurred. The first is the endosymbiotic theory, or
enosymbiosis, and the other is the autogenous theory, or autogenisis. These two
theories are not mutually exclusive, meaning one or the other could account for
different parts of eukaryotic cells. The endosymbiotic theory states that the
formation of eukaryotic cells were symbiotic associations of prokaryotic cells
living inside larger prokaryotes. The endosymbiotic hypothesis accounts for the
presence in eukaryotic cells of complex organelles not found in the far simpler
prokaryotes. Many modern organisms contain intracellular symbiotic bacteria,
cyanobacteria, or photosynthetic protists, indicating that such associations are
not difficult to establish and maintain. Endosymbiosis is said to be
responsible for the presence of chloroplasts and mitochondria in eukaryotes.
Autogenisis, the ...

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PAPER DETAILS

Added: 6/22/2008 04:10:09 PM
Category: Science & Nature
Type: Free Paper
Words: 471
Pages: 2

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