Peptidoglycan is also known by which alternative names in microbiology terminology?

Introduction / Context:
Microbiology texts and older literature use several synonymous terms for the bacterial cell wall polymer. Recognizing these synonyms avoids confusion when reading diverse sources or exam questions.

Given Data / Assumptions:

• The polymer of interest is peptidoglycan, composed of alternating N-acetylglucosamine and N-acetylmuramic acid with peptide cross-links.
• Common synonyms must be identified among options.

Concept / Approach:
Both “mucopeptide” and “murein” historically refer to peptidoglycan. The terms emphasize its mixed carbohydrate (muco-) and peptide nature. Modern usage favors “peptidoglycan,” but older names appear in classic references and test banks.

Step-by-Step Solution:

Verification / Alternative check:
Standard bacteriology glossaries list murein/mucopeptide as synonyms for peptidoglycan.

Why Other Options Are Wrong:

• A or B alone: incomplete because both are valid synonyms.
• None of these: incorrect since both are correct synonyms.

Common Pitfalls:
Assuming each option is exclusive; in this case, the inclusive choice is correct.

Final Answer:
both (a) & (b)