A-LevelBiologyBiological molecules9700/12 · Oct/Nov 2017 · Q101 Mark
The diagram shows the structure of the polysaccharide chitin which is found in the cell wall of fungi. [Figure 10.1 - molecular diagram of chitin structure] 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°. 3 The polysaccharide contains the elements carbon, hydrogen, oxygen and nitrogen.
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A1, 2 and 3
B1 and 2 only
C1 and 3 only
D2 and 3 only
✓ Correct answer
B: 1 and 2 only
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