
Archaea
- a. are most genetically related to bacteria.
- b. contain a nucleus.
- c. cannot cause disease in humans.
- d. lack peptidoglycan in their cell walls.

Introduction:
The domain classification consists of prokaryotes, eukaryotes, and archaea. The prokaryotes include the group of bacteria which are unicellular organisms, without a nucleus and chromosomes condensed in the cytoplasm. Archaea include the group of ancient bacteria. The domain eukaryotes include protists, fungi, Plantae, and animalia.
Answer to Problem 1Q
Correct answer:
Archaea lack peptidoglycan in their cell walls. Therefore, option (d) is correct.
Option (d) is given as “lack peptidoglycan in their cell walls”.
Explanation of Solution
Justify the reasons for the correct statement:
Archaea contains single and circular chromosomes. Ribosomes are the 70S, but their structure is similar to 80S. Nucleus and membrane-bound organelles are absent but have a bacterial-like metabolism. The peptidoglycans and cell wall are absent in archaea, but theseare present in bacteria.
Hence, option (d) is correct.
Justify the reasons for the incorrect statements:
Option (a) is given as “are most genetically related to bacteria”.
Archaea are genetically related to bacteria. Archaea initially are defined as archaebacteria. Hence, it is a wrong answer.
Option (b) is given as “contain a nucleus”.
Both archaea and bacteria are unicellular organisms and contain do not contain a nucleus. Hence, it is a wrong answer.
Option (c) is given as “cannot cause disease in humans”.
Both bacteria and archaea can be opportunistic pathogens and cause disease in humans. Hence, it is a wrong answer.
Hence, options (a),(b), and(c) are incorrect.
It was once thought that bacteria and archaea belonged to the prokaryotic domain and similar to bacteria, but later they showed some distinctive difference in their cell wall and ribosomes.
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