Which of the following traits are observed in archaea ?
(A) Absence of Peptidoglycan in cell wall
(B) Resistant to kanamycin
(C) Endospore formation
(D) Presence of S layer
Choose the correct answer from the options given below:
(A) Absence of Peptidoglycan in cell wall
(B) Resistant to kanamycin
(C) Endospore formation
(D) Presence of S layer
Choose the correct answer from the options given below:
Show Hint
- (A), (B) and (D) only.
- (A), (B) and (C) only.
- (C) only
- (C) and (D) only.
The Correct Option is A
Solution and Explanation
Archaea constitute a unique domain of single-celled microorganisms that lack cell nuclei.
Although they resemble bacteria morphologically, they possess distinct biochemical, genetic, and physiological characteristics that are closer to eukaryotes.
Step 2: Detailed Explanation:
Let us evaluate each of the listed biological traits for Archaea:
- (A) Absence of Peptidoglycan in cell wall: True.
The cell walls of Archaea do not contain peptidoglycan (murein), which is a signature component of bacterial cell walls.
Instead, archaeal cell walls are composed of pseudopeptidoglycan (pseudomurein), proteins, glycoproteins, or complex polysaccharides.
- (B) Resistant to kanamycin: True.
Archaea are naturally resistant to many common antibacterial antibiotics, including kanamycin and other aminoglycosides, because their ribosome structure and translation machinery differ significantly from those of bacteria.
- (D) Presence of S layer: True.
Many archaeal species possess a crystalline surface layer (S-layer) composed of a monomolecular array of identical proteins or glycoproteins, which serves as a protective physical barrier.
- (C) Endospore formation: False.
Endospore formation is a highly specialized survival mechanism restricted to certain Gram-positive bacteria, particularly the Firmicutes (such as Bacillus and Clostridium species).
Archaea do not form endospores.
Therefore, only traits (A), (B), and (D) are observed in Archaea.
Step 3: Final Answer:
The traits observed in archaea are (A), (B), and (D) only, corresponding to option (A).
Top ICAR AIEEA Plant Sciences Questions
- Both plant and animal cells contain some small organelles called 'peroxisomes', which are dedicated to the metabolism of substances such as
- Chemicals that store energy for the majority of work within cells are called
- The longest phase during the eukaryotic cell cycle is
- The formula: [Sum of (Observed-Expected)$^2$/Expected] is also known as
- Human beings have a large-sized 'proteome'. The principal and more significant reason for this is-
Top ICAR AIEEA Microbiology Questions
- Choose the correct order of the following microbes based on their requirement of host - from dead to living
(A). Saprotrophs
(B). Biotrophs
(C). Hemibiotrophs
(D). Nectrotrophs - Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
Assertion (A): The secondary spread of the pathogen propagules that are identical in virulence is mostly responsible for epidemics.
Reason (R): Secondary propagules are mostly asexually produced.
In light of the above statements, choose the correct answer from the options given below. Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
• [Assertion (A):] Biotrophs can be easily cultured in artificial medium.
• [Reason (R):] Biotrophs lost their independent growth due to co-evolution with the host.
In light of the above statements, choose the most appropriate answer from the options given below:
Given below are two statements, one is labelled as Assertion (A) and other labelled as Reason (R).
• [Assertion (A):] Phytoplasma do not have cell wall and motility.
• [Reason (R):] Phytoplasma colonize phloem.
In light of the above statements, choose the correct answer from the options given below.
Given below are two statements:
• [Statement (I):] Bacteria need pre-existing openings or wounds on plants to initiate infection.
• [Statement (II):] Bacteria do not produce specialized infective structures.
In light of the above statements, choose the most appropriate answer from the options given below.
Top ICAR AIEEA Questions
- Which of the following statements is false?
- Which of the following is an example of an inventory?
- According to Adam Smith, productivity gains could be brought about through .
- The supply curve for an artificially scarce good is .
- Which of the following would not be considered an opportunity cost of paid employment?