The straight-chain form of glucose has an aldehyde group at carbon 1.

A reaction between this aldehyde group and the hydroxyl group at carbon 5 gives rise to a ring form.

Depending on the orientation of the aldehyde group when the ring closes, either of two molecules a-glucose or P-glucose forms.

3.13 Glucose: From One Form to the Other All glucose molecules have the formula C6H12O6, but their structures vary. When dissolved in water, the a and p "ring"forms of glucose interconvert.

Three-carbon sugar

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Essentials of Human Physiology

Essentials of Human Physiology

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