The Amylose Molecule - rotatable in 3 dimensions

Amylose is the name given to linear sections of the starch molecule consisting of alpha 1,4 linked glucose units.

This model shows 36 glucose units, forming a helical structure - effectively a tube.
 Move the molecule end on to see this
 Start/stop rotation

Incidentally, iodine migrates into the space within the molecule and gives the characteristic blue-black colour used in the starch test.

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