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19.2 The Three-Domain System -- Part 2
The cell wall structure of archaea might help them live in extreme conditions.
The branched nature of diverse lipids in the archaeal plasma membrane is different from that of thebacterial plasma membrane.
The archaea thrive in environments that are similar to those of the early Earth.
The methanogens live in environments where methane is abundant, such as swamps, marshes, and the guts of animals.
The halophiles thrive in salty environments like the Great Salt Lake in Utah.
Eukaryotes are single-celled to multicellular organisms.
They also have a variety of different parts, some of which came from other single-celled organisms.
Sexual reproduction is common in the eukaryotes.
We will look at the individual kingdoms that occur within the domain Eukarya later in this text.
The protists are a diverse group of single-celled eukaryotes that are hard to classify and define.
Some protists have colonies.
There are true tissues on Page 343.
Heterotrophic by ingestion or absorption is one of the differences in nutrition.
Green algae, paramecia, and slime molds are protists.
The protists are placed in six super groups.
Fungi have cell walls with chitin and form spores that lack flagella.
They are multicellular with a few exceptions.
The saprotrophic nature of the Fungi is due to their absorption of vitamins and minerals from decaying organic matter.
Representative fungi include mushrooms, molds, and yeasts.
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