Question

Match List I with List II

• A. A(III), B(I), C(II), D(IV)
• B. A(I), B(III), C(II), D(IV)
• C. A(I), B(III), C(IV), D(II)
• D. A(III), B(I), C(IV), D(II)

Hint:

Gram Positive -> Teichoic acid.
Gram Negative -> LPS O-antigen.
Fungi -> Chitin.
Archaea -> Pseudomurein.

Answer 1

The Correct Option is D

Step 1: Understanding the Question:
The question asks to pair specific cell wall biochemical markers with the corresponding groups of organisms.
Cell wall chemistry is a cornerstone of taxonomy in microbiology and mycology.

Step 2: Detailed Explanation:

• A. Chitin: Chitin is a homopolymer of N-acetylglucosamine. It provides structural rigidity to the cell walls of Fungi. Hence, A matches with III.

• B. Pseudomurein: Also known as pseudopeptidoglycan, this is the structural polymer found in the cell walls of certain Archaebacteria (like methanogens). It is chemically distinct from the murein of bacteria. Hence, B matches with I.

• C. O-antigens: These are the distal polysaccharide chains of Lipopolysaccharide (LPS) molecules. LPS is found exclusively in the outer membrane of Gram-negative bacteria. Hence, C matches with IV.

• D. Teichoic acid: These are phosphate-rich polymers of glycerol or ribitol. They are found interspersed in the thick peptidoglycan layers of Gram-positive bacteria. Hence, D matches with II.

Step 3: Final Answer:
Summarizing the matches: A-III, B-I, C-IV, D-II. This corresponds to the sequence in option (D).