Question

Peptidoglycan is a complex polymer of sugars and amino acids; the substance from which bacterial cell walls are made. Choose set of correct statements below with respect to peptidoglycan:
(A) A rigid layer of peptidoglycan consist of NAG and NAM which is crosslinked by short peptides
(B) Antibiotics including penicillin does not inhibit peptidoglycan synthesis
(C) Gram positive bacteria contain thick layer of peptidoglycan
(D) Gram negative bacteria have less peptidoglycan
Choose the correct answer from the options given below:

• A. (A), (B) and (D) only.
• B. (A), (B) and (C) only.
• C. (B), (C) and (D) only.
• D. (A), (C) and (D) only.

Hint:

Peptidoglycan = NAG + NAM + Peptide cross-links.
- Thick in Gram-Positive bacteria (retains crystal violet).
- Thin in Gram-Negative bacteria (loses crystal violet).
- Targeted and inhibited by penicillin.

Answer 1

The Correct Option is D