What is peptidoglycan made up of?

Answer 1

A peptidoglycan is a cross-linked polymer of sugars and short peptides that makes up the cell walls of all bacteria.

See the schematic diagram below.

The sugar component consists of alternating residues of N-acetylglucosamine (NAG, shown as G above)) and N-acetylmuramic acid (NAM, shown as M above)

joined by β-1,4 linkages.

Attached to the N-acetylmuramic acid is a peptide chain of three to five amino acids.

The peptide chain can be cross-linked to the peptide chain of another strand either directly as above or by a pentaglycine bridge

to form a 3D mesh-like layer.

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Answer 2

Eli Ayoub

Peptidoglycan is made up of repeating units of a disaccharide called N-acetylglucosamine (NAG) and N-acetylmuramic acid (NAM), which are connected by peptide cross-links.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.