Question

While le examining a rock surface, you have discovered an interesting new organism. Which of the criteria will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya?
A) It is unicellular
B) Cell walls are made primarily of peptidoglycan
C) The lipids in its plasma membrane consist of plycerol bonded to straight-chain fatty acids.
D) The organism does not have nucleus
E) It can survive at a temperature over 100°C

Answer 1

Answer:

The correct answer is- B) Cell walls are made primarily of peptidoglycan

Explanation:

There is a difference between the cell wall of bacteria, archaea, and eukarya. The cell wall of bacteria is primarily made up of peptidoglycan which contains two sugar  N-acetylglucosamine and N-acetylmuramic acid while archaea contain two N-acetyltalosaminuronic acid (NAT) in place of N-acetylmuramic acid which is called pseudo-peptidoglycan.

Eukaryotic cell wall is also different from archaeal and bacterial cell wall and animals in eukaryotes do not have a cell wall. Therefore cell wall made up primarily of peptidoglycan will allow you to classify the organism as belonging to Bacteria but not Archaea or Eukarya.