2.8 Domains of Life

What are the THREE domains?

• Plant

• Eukarya

• Archaea

• Bacteria

Answer explanation

The three domains of life are Eukarya, Archaea, and Bacteria. Eukarya includes all eukaryotic organisms, while Archaea and Bacteria consist of prokaryotic organisms, distinguishing them from eukaryotes.

What does autotrophic mean?

• The ability of an organism to make its own food

• The ability of an organism to get its food from other organisms

Answer explanation

Autotrophic refers to organisms that can produce their own food, typically through photosynthesis or chemosynthesis. This distinguishes them from heterotrophic organisms, which obtain food from other sources.

Tags

NGSS.MS-LS1-6

__ can be found in extreme environments such as hot springs.

• Archaea 

• Eukaryotes

Answer explanation

Archaea are a group of microorganisms known for thriving in extreme environments, such as hot springs, due to their unique biochemical adaptations. Eukaryotes, on the other hand, are generally not found in such harsh conditions.

Which is the largest, broadest group and level when classifying organisms?

• Kingdoms

• Taxonomy

• Species

• Domains

Answer explanation

The largest and broadest group in the classification of organisms is 'Domains'. It encompasses all life forms, while 'Kingdoms' and 'Species' are more specific categories within this hierarchy.

Match the following domains with their characteristics.

• Organisms with cells that contain a nucleus and organelles.

• Eukarya

• Single-celled organisms without a nucleus, often found in extreme environments.

• Archaea

• Single-celled organisms without a nucleus, often found in diverse environments.

• Bacteria

Tags

NGSS.MS-LS1-1

NGSS.MS-LS1-2

Match the following domains with the environments they are typically found in.

• Includes organisms like plants, animals, and fungi

• Archaea

• Thrives in extreme environments such as volcanic hot springs

• Bacteria

• Found in diverse environments including soil, water, and human bodies

• Eukarya

Tags

NGSS.MS-LS2-3

Which FOUR of the following belong to the Domain Eukarya?

• Protista

• Plantae

• Animalia

• Fungi

• Bacteria

Answer explanation

The Domain Eukarya includes organisms with complex cells. Protista, Plantae, Animalia, and Fungi are all eukaryotic groups, while Bacteria belong to a different domain (Prokarya). Thus, the correct choices are Protista, Plantae, Animalia, and Fungi.

Tags

NGSS.MS-LS4-2

Which domain do humans belong to?

• Bacteria

• Archaea

• Eukarya

• Prokarya

Answer explanation

Humans belong to the domain Eukarya, which includes all organisms with complex cells containing a nucleus. In contrast, Bacteria and Archaea are prokaryotic domains, lacking a nucleus.

This animal is a unicellular, prokaryote autotroph that lives in Yellowstone hot springs. The hot springs can reach up to 200 degrees Fahrenheit. This organism belongs to the Domain __.

• Eukarya

• Bacteria

• Archaea

Answer explanation

The organism described is a unicellular, prokaryote autotroph found in extreme environments like Yellowstone hot springs. This indicates it belongs to the Domain Archaea, known for thriving in extreme conditions, unlike Bacteria or Eukarya.

Which is TRUE about members of the domain Archaea?

• They are unicellular.

• They are eukaryotes.

• They lack cell walls.

• They lack cell membranes.

Answer explanation

Members of the domain Archaea are unicellular organisms, meaning they consist of a single cell. They are not eukaryotes, as they lack a nucleus, and they do have cell walls and membranes.