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Microbiology: An Introduction | 11th Edition | ISBN: 9780321733603 | Authors: Gerard J. Tortora
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The Three-Domain System: Carl Woese's Life Classification

Chapter 1, Problem 1.1

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QUESTION:

How are bacteria, archaea, fungi, protozoa, algae, and viruses distinguished on the basis of cellular structure?

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QUESTION:

How are bacteria, archaea, fungi, protozoa, algae, and viruses distinguished on the basis of cellular structure?

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Bacteria, archaea, fungi, protozoa, algae, and viruses are distinguished based on cellular structure. The three-domain system is the biological classification Carl Woese introduced in 1978. This system is based on the cellular organization of organisms. The three domains are as follows: -

1. Bacteria domain: - the cell wall contains peptidoglycan and is prokaryotic and unicellular.

2. Archaea domain: - they are prokaryotes. If they have a cell wall, the cell wall lacks peptidoglycan.

3. Eukarya domain: - classified into following

• Protists: - include slime molds, protozoa, and algae. Protozoa and algae are uni or multicellular eukaryotes.

• Fungi: – yeasts, multicellular molds.

• Plants: – flowering plants, conifers, etc.

• Animals: – insects and vertebrates etc.

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The Three-Domain System: Carl Woese's Life Classification
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Explore the influential Three-Domain System of classification, introduced by Carl Woese in 1978. Discover how it categorizes life into Bacteria, Archaea, and Eukarya based on distinctive cellular structures. Learn about the characteristics of each domain, from prokaryotic Bacteria and Archaea to the rich diversity within Eukarya, encompassing Protists, Fungi, Plants, Animals, and the unique world of viruses.

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