Question:
Choose the incorrect statement regarding Archaebacteria:
Choose the incorrect statement regarding Archaebacteria:
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Archaea differ from bacteria mainly in cell wall composition (no peptidoglycan) and membrane lipids (branched ether-linked lipids).
Updated On: Jun 20, 2026
- They are halophiles and thermoacidophiles
- The cell wall contains peptidoglycan
- The cell membrane contains branched chain lipids
- They are responsible for production of methane from dung of animals
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The Correct Option is B
Solution and Explanation
Step 1: Understanding Archaebacteria.
Archaebacteria (Archaea) are primitive prokaryotes that survive in extreme environments such as high salinity, high temperature, and anaerobic conditions. Their cellular structure is fundamentally different from eubacteria.
Step 2: Analysis of statement (1).
Halophiles (salt-loving) and thermoacidophiles (heat and acid-loving organisms) are well-known groups of archaea. Therefore, statement (1) is correct.
Step 3: Analysis of statement (2).
Archaebacteria do NOT contain peptidoglycan in their cell wall. Instead, they may have pseudopeptidoglycan or other protein-based structures. Hence, statement (2) is incorrect.
Step 4: Analysis of statement (3).
The cell membrane of archaea contains branched chain lipids linked by ether bonds, which provide stability in extreme environments. Therefore, statement (3) is correct.
Step 5: Analysis of statement (4).
Methanogenic archaea produce methane from organic matter such as animal dung in anaerobic conditions. Hence, statement (4) is also correct.
Step 6: Final conclusion.
Since only statement (2) is incorrect, it is the correct answer.
\[ \boxed{(2)} \]
Archaebacteria (Archaea) are primitive prokaryotes that survive in extreme environments such as high salinity, high temperature, and anaerobic conditions. Their cellular structure is fundamentally different from eubacteria.
Step 2: Analysis of statement (1).
Halophiles (salt-loving) and thermoacidophiles (heat and acid-loving organisms) are well-known groups of archaea. Therefore, statement (1) is correct.
Step 3: Analysis of statement (2).
Archaebacteria do NOT contain peptidoglycan in their cell wall. Instead, they may have pseudopeptidoglycan or other protein-based structures. Hence, statement (2) is incorrect.
Step 4: Analysis of statement (3).
The cell membrane of archaea contains branched chain lipids linked by ether bonds, which provide stability in extreme environments. Therefore, statement (3) is correct.
Step 5: Analysis of statement (4).
Methanogenic archaea produce methane from organic matter such as animal dung in anaerobic conditions. Hence, statement (4) is also correct.
Step 6: Final conclusion.
Since only statement (2) is incorrect, it is the correct answer.
\[ \boxed{(2)} \]
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