Discussion
The NAG and NAM of the peptidoglycan layer are linked by _________
Answer: A
Correct answer: beta-(1,4) glycosidic linkage
NAG and NAM alternate along the glycan backbone, joined by β-(1,4) bonds - the linkage that gives cellulose and chitin their strength too, and the one that lysozyme cleaves. An α linkage would give a storage polymer such as starch, not a structural one.
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