Archaebacteria, once thought to be primitive extremophiles, are now recognized as a distinct domain. Initially believed to inhabit only extreme environments, their biochemical and genetic traits are more akin to eukaryotes than bacteria.

What distinguishes archaebacteria from bacteria?

• They are more primitive than bacteria.

• They are only found in extreme environments.

• They are considered a distinct domain.

• They have a nucleus.

What was the initial belief about the environments archaebacteria inhabited?

• They were only in freshwater lakes.

• They thrived in extreme environments.

• They were found in urban areas.

• They lived in moderate climates.

Which of the following environments were archaebacteria initially thought to inhabit?

• Tundras

• Deserts

• Saline lakes

• Rainforests

How do the biochemical characteristics of archaebacteria compare to other organisms?

• They are more similar to bacteria.

• They are unique and unlike any other organisms.

• They are identical to fungi.

• They are more similar to eukaryotes.

What is now known about the genetic makeup of archaebacteria?

• It is identical to that of bacteria.

• It is more similar to viruses.

• It is more similar to eukaryotes than bacteria.

• It is completely unique and unrelated to other domains.