Download Notes - Endosymbiotic Theory

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Endosymbiotic
Theory
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The Endosymbiotic Theory
 Review:
 What
is a theory?
 What is the difference between prokaryotic and eukaryotic
cells?
 The
endosymbiotic theory is the idea that a long
time ago, prokaryotic cells engulfed other
prokaryotic cells by endocytosis. This resulted in
the first eukaryotic cells.
 First
proposed by Lynn Margulis
 Explains the origin of eukaryotic cells
 Explains the origin of certain membrane-bound organelles
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What Exactly Happened?
Membrane-Bound Organelles
 Mitochondria
=
membrane-bound
organelle that
produces energy for
the cell
 Chloroplast
=
membrane-bound
organelle that captures
sunlight and uses it to
make food for the cell
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Evidence in support of the
endosymbiotic theory:

Similarities between mitochondria,
chloroplasts, & prokaryotes:
1. Circular DNA
2. Ribosomes
3. Binary fission
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Let’s sum it all up..
Mitochondria
evolved from aerobic bacteria
(survives and grows with oxygen) that were
engulfed by a larger prokaryotic cell.
Chloroplasts
evolved from endosymbiotic
photosynthetic (use the sun for energy)
bacteria.
The
first eukaryotic cells evolved from a
mutually beneficial relationship between two or
more prokaryotic cells.
EUKARYOTIC
evolved from PROKARYOTIC!
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