Sucrose is a disaccharide composed of which two simple sugars?

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To determine which two simple sugars form sucrose, we need to recall the composition of common disaccharides and the pairing in sucrose specifically.
Option 1: 'Glucose and glucose' would yield a disaccharide like maltose, which is glucose-glucose, not sucrose. This pairing describes a linkage of two identical monosaccharides, which is characteristic of certain disaccharides but not sucrose.
Option 2: 'Glucose and galactose' corresponds to a disaccharide known as lactose when galactose is paired with glucose. This combination is not the constituent of sucrose.
Option 3: 'Fructose and galactose' is not a standard common disaccharide in mammalian biology and does not match the composition of sucrose; it would be an unusual, non-classical pairing.
Option 4: 'Glucose and fructose' describes a disaccharide in which the monosaccharides are glucose and fructose. Sucrose is defined chemically as glucose linked to fructose via a glycosidic bond, which is distinct from other disaccharides in its sugar components and linkage pattern.
In summary, the correct concept to apply is that sucrose is formed from a glucose unit joined to a fructose unit, rather than two of the same sugar or other combinations. The other options either describe maltose (glucose-glucose), lactose (galactose-glucose), or an atypical sugar pairing, none of which matches sucrose.

KNHES 5416 AU2025 (13351) Exam 2

Sucrose is a disaccharide composed of which two simple sugars?

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