The 'three-domain system' is a biological classification introduced by Carl Woese in 1990. This system categorizes life into three major domains: Bacteria, Archaea, and Eukarya.

1. Bacteria: This domain includes prokaryotic microorganisms, which are single-celled. They are characterized by the lack of a nucleus and other membrane-bound organelles. Bacteria can be found in various environments such as soil, water, and even inside the human body.

2. Archaea: Like bacteria, archaea are prokaryotic, meaning they also lack a nucleus. However, they are distinct from bacteria in their genetic makeup and metabolism. Archaea are often found in extreme environments, such as hot springs and salt lakes.

3. Eukarya: This domain includes all organisms that have cells with a nucleus. This means all protists, fungi, plants, and animals fall under this domain. The cells of eukaryotes are typically much larger than those of bacteria and archaea.

This system of classification is based on differences in ribosomal RNA structure. It has been widely accepted because it recognizes the fundamental differences between these three categories of life.

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The 'three-domain system' is a biological classification introduced by Carl Woese in 1990. This system categorizes life into three major domains: Bacteria, Archaea, and Eukarya.

1. Bacteria: This domain includes prokaryotic microorganisms, which are single-celled. They are characterized by the lack of a nucleus and other membrane-bound organelles. Bacteria can be found in various environments such as soil, water, and even inside the human body.

2. Archaea: Like bacteria, archaea are prokaryotic, meaning they also lack a nucleus. However, they are distinct from bacteria in their genetic makeup and metabolism. Archaea are often found in extreme environments, such as hot springs and salt lakes.

3. Eukarya: This domain includes all organisms that have cells with a nucleus. This means all protists, fungi, plants, and animals fall under this domain. The cells of eukaryotes are typically much larger than those of bacteria and archaea.

This system of classification is based on differences in ribosomal RNA structure. It has been widely accepted because it recognizes the fundamental differences between these three categories of life.

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The 'three-domain system' is a biological classification introduced by Carl Woese in 1990. This system categorizes life into three major domains: Bacteria, Archaea, and Eukarya.

1. Bacteria: This domain includes prokaryotic microorganisms, which are single-celled. They are characterized by the lack of a nucleus and other membrane-bound organelles. Bacteria can be found in various environments such as soil, water, and even inside the human body.

2. Archaea: Like bacteria, archaea are prokaryotic, meaning they also lack a nucleus. However, they are distinct from bacteria in their genetic makeup and metabolism. Archaea are often found in extreme environments, such as hot springs and salt lakes.

3. Eukarya: This domain includes all organisms that have cells with a nucleus. This means all protists, fungi, plants, and animals fall under this domain. The cells of eukaryotes are typically much larger than those of bacteria and archaea.

This system of classification is based on differences in ribosomal RNA structure. It has been widely accepted because it recognizes the fundamental differences between these three categories of life.

Describe the ‘three-domain system’ of classification.

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