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HomeHomework HelpbiologyThree Domains of Life

Three Domains of Life

The three domains of life—Bacteria, Archaea, and Eukarya—represent the highest taxonomic classification of living organisms, where Bacteria and Archaea consist of prokaryotic cells lacking a nucleus, while Eukarya includes organisms with eukaryotic cells that possess a defined nucleus and membrane-bound organelles. This classification reflects fundamental differences in cellular structure, genetics, and evolutionary history among these groups.

intermediate
2 hours
Biology
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The three domains of life—Bacteria, Archaea, and Eukarya—represent the fundamental categories of all living organisms. Each domain has unique characteristics that define its members, such as cellular structure and genetic makeup. Bacteria are simple, single-celled organisms, while Archaea are simila...

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Key Terms

Bacteria
Single-celled organisms without a nucleus.

Example: E. coli is a common type of bacteria.

Archaea
Microorganisms similar to bacteria but genetically distinct.

Example: Methanogens are a type of archaea that produce methane.

Eukarya
Organisms with complex cells containing a nucleus.

Example: Humans and trees are eukaryotic organisms.

Cell Structure
The arrangement and organization of cellular components.

Example: Bacterial cells have a simple structure compared to eukaryotic cells.

Metabolism
The chemical processes that occur within a living organism.

Example: Photosynthesis is a metabolic process in plants.

Multicellularity
Organisms composed of multiple cells.

Example: Animals and plants are multicellular.

Related Topics

Microbial Ecology
Study of microorganisms in their natural environments and their interactions.
intermediate
Genetic Engineering
Manipulation of an organism's DNA to achieve desired traits.
advanced
Evolutionary Biology
Study of the processes that drive the evolution of life.
intermediate

Key Concepts

Cell StructureGenetic DifferencesMetabolic PathwaysEvolutionary Relationships