Kingdom Protista.

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Presentation transcript:

Kingdom Protista

Protists About 1.5 billion years old Are EUKARYOTIC organisms With nuclei and membrane bound organelles Are unicellular Some live as individual cells while other live in groups (colonial) Classification is difficult because they have characteristics in common with animals, plants and fungi; about 115,000 species

Evolution of Protists Originally protists were thought to have evolved from prokaryotic cells that evolved nuclei

Endosymbiont Hypothesis Lynn Marguilis (biologist) instead suggested that the first eukaryotic cell was formed by symbiosis among several prokaryotes (living together in close association) Ie. Organelles in protists resemble monerans (eg. Mitochondria and chloroplasts resemble bacteria)

It is believed that prokaryotes started living within another prokaryote – both benefited from the relationship and eventually they could not live without one another. This gave rise to organelles in eukaryotes

Thus, organelles in eukaryotic cells probably evolved from symbiotic prokaryotes that lived inside a host cell (Endosymbiont Hypothesis)

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