Lactose is made of:

Question

Lactose is made of:

BlackTom AI · Accepted Answer

Lactose is a disaccharide commonly found in milk, and its composition is two monosaccharide units joined together. 
Option 1: glucose + galactose. This is the correct pairing, since lactose is specifically made of one glucose molecule linked to one galactose molecule via a β-1,4-glycosidic bond. The identity of the two monosaccharides is what defines lactose. 
Option 2: glucose + glucose. That combination corresponds to maltose, not lactose, so this choice misidentifies the second sugar involved. 
Option 3: glucose + fructose. This pair would form a different disaccharide (sucrose is glucose + fructose, but with a α-1,2-glycosidic linkage), not lactose, making this option inaccurate for lactose. 
Option 4: fructose + galactose. This pairing does not correspond to a common dietary disaccharide; it’s not lactose and thus is incorrect for the question at hand. 
Overall, recognizing lactose as glucose plus galactose with a β-1,4 linkage clarifies why Option 1 is the accurate description and why the others do not match lactose’s composition.

Lactose is made of:单项选择题

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