Discussion
The covalent bond which links the cell walls of gram-positive bacteria containing two modified sugars - N - acetylmuramic acid (NAM) and N-acetyl glucosamine (NAG) is
Answer: B
Correct answer: 1,4-glycosidic bond
The glycan backbone is an alternating chain of NAM and NAG joined by β-1,4-glycosidic bonds - the same linkage as in cellulose and chitin. It is precisely this bond that lysozyme hydrolyses, which is why tears and saliva can lyse many bacteria.
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