Which of the following correctly describes a reaction that forms a disaccharide from two monosaccharides?
a. cellulose + fructose -> maltose
b. glucose + fructose -> sucrose
c. glycogen + lactose -> cellulose
d. lactose + glucose -> galactose

The right answer is b. Glucose + fructose -> sucrose  

Sucrose is a carbohydrate composed of a molecule of glucose associated with a molecule of fructose by a glycosidic bond. It is therefore a diholoside (or disaccharide in the old nomenclature). They also called α-D-glucopyranosyl- (1↔2) -β-D-fructofuranoside and its formula is C12H22O11.

answer: glucoamylase presented optimum activity at temperature of 55â°c, and, in the glycosidic bonds from the non-reducing ends of starch, resulting in the production of glucose. source and type of fermentation can affect the enzyme's properties

credit to kalahira

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