(a) Deduce the structure of the disaccharide trehalose from the following information: Complete hydrolysis yields only D-glucose; it is hydrolyzed by α-glucosidase but not β-glucosidase; and it does not reduce Cu2+ to Cu+.
(b) When exposed to dehydrating conditions, many plants and invertebrates synthesize large amounts of trehalose, which enables them to survive prolonged desiccation. What properties of the trehalose molecule might allow it to act as a water substitute?