Homogalacturonan is a polysaccharide found in plant cell walls.
The diagram shows a molecule of the monomer used to form homogalacturonan.
A student studied the structure of this monomer and compared it with the structure of the monomer used to form cellulose.
Which carbon atoms in the monomer in the diagram have hydroxyl groups arranged in different positions to those found in the cellulose monomer?
carbon one and carbon four
2 )
carbon one only
3 )
carbon three and carbon four
4 )
carbon three only
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