Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?

Question

BlackTom AI · Accepted Answer

First, the question describes lactose as a sugar in milk composed of one glucose molecule linked glycosidically to one galactose molecule, and asks how lactose is classified. 
Option 1: 'As a pentose' — This is incorrect because a pentose is a five-carbon sugar. Lactose contains six carbons in total (glucose and galactose each are C6), so it cannot be a pentose. 
Option 2: 'As a hexose' — While each monosaccharide unit (glucose or galactose) is a hexose (six-carbons), the overall lactose molecule is a disaccharide formed by two hexose units. So labeling lactose itself as a hexose would ignore its disaccharide nature; this makes the option inaccurate for the classification asked. 
Option 3: 'As a polysaccharide' — Polysaccharides are long chains of many monosaccharide units (e.g., starch, cellulose). Lactose is only composed of two monosaccharide units, not a polymeric chain, so this choice is incorrect. 
Option 4: 'As a disaccharide' — This correctly describes lactose: it consists of two monosaccharide units (glucose and galactose) linked by a glycosidic bond, forming a disaccharide. 
Option 5: 'As a monomer' — A monomer is a single sugar unit, whereas lactose is a combination of two. Therefore this option misclassifies lactose as a single unit rather than a compound formed from two units. 
In summary, understanding lactose as a molecule made from two monosaccharides linked together aligns with the definition of a disaccharide, not a pentose, hexose, polysaccharide, or monomer. The disaccharide classification best fits the structural description provided in the question.

Lactose, a sugar in milk, is composed of one glucose molecule joined by a glycosidic linkage to one galactose molecule. How is lactose classified?单项选择题

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