The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi.
Which statements are correct for chitin and for cellulose?
1) The monomers are joined by 1,4 glycosidic bonds.
2) Every second monosaccharide in the polysaccharide chain is rotated by ${180^ \circ }$.
3) The polysaccharide contains the elements carbon, hydrogen, oxygen and nitrogen.
1 )
1, 2 and 3
1 and 2 only
3 )
1 and 3 only
4 )
2 and 3 only
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