While examining a rock surface, you have discovered an interesting new organism. Which of the following criteria will allow you to classify the organism as belonging to Bacteria, but not Archaea or Eukarya?
A) It is unicellular.
B) The organism does not have nucleus.
C) Its cell walls are made primarily of peptidoglycan.
D) It can survive at a temperature over 100°C.

Question

Quizplus · Accepted Answer

The criterion that allows the organism to be classified as belonging to Bacteria but not Archaea or Eukarya is the fact that its cell walls are made primarily of peptidoglycan. This is a defining characteristic of bacteria and is not found in archaea or eukarya. The other options listed, such as being unicellular or not having a nucleus, are not specific enough to distinguish between the three domains of life. The ability to survive at high temperatures is also not a defining characteristic of any particular domain.

While Examining a Rock Surface, You Have Discovered an Interesting