The monsaccharide glucose is best described by which one of the following  statements?
Two monosaccharide units are linked by a glycosidic bond or yield 2 monosaccharide units on hydrolysis. Depending on their reducing property, they are divided into:

Nonreducing disaccharides: The functional groups are involved in the glycosidic bond formation, hence free functional groups are not available
Reducing disaccharides: Free functional groups are available.

Key Concept:

Glucose forms part of sucrose and is attached to fructose to form disaccharide i.e.,sucrose.
It usually exists in the furanose form
It is a ketose
It possesses an anomeric C-2 carbon atom
It forms part of the disaccharide sucrose