Development of the Eukaryotic Organism:

one of the molecules that formed early on was chlorophyll
organisms containing this molecule were able to produce their own food
this released oxygen into the atmosphere
eventually mutations arose in some of these cells, enabling them to use the oxygen to release the energy from their molecules
most scientists accept the idea that photosynthetic and other cells were engulfed (swallowed up) by larger prokaryotes.
they were not destroyed, they just remained within the larger cells
how the nucleus formed is debatable
one view is that the cell membrane began to fold
another is that it was formed by engulfing another prokaryote
Archea and Eubacteria arose independently as the earliest life forms
Archea contains prokaryotic life forms that are found in extreme conditions
The Eubacteria are a very diverse group
mutations in the nucleic acid of the original organisms resulted in new life forms
these new life forms had effects on the environment
gradual changes in the organisms over time, originating from the mutations, are termed evolution
organisms that have features that enable them to survive have adapted to the environment
if they do not posses these adaptations it is likely they will die

	Created by bhope almost 11 years ago

Note on Biology Exam Notes, created by bhope on 20/05/2013.

Biology Exam Notes