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Lactose is formed by (a) glucose + gluco...

Lactose is formed by
(a) glucose + glucose
(b) glucose + galactose
(c) glucose + fructose
(d) fructose + galactose

A

glucose + glucose

B

glucose + galactose

C

glucose + fructose

D

fructose + galactose

Text Solution

AI Generated Solution

The correct Answer is:
To determine the correct answer to the question about the formation of lactose, we can follow these steps: ### Step-by-Step Solution 1. **Understand the Structure of Lactose**: - Lactose is a disaccharide, which means it is composed of two monosaccharide units. 2. **Identify the Monosaccharides**: - The two monosaccharides that can combine to form lactose are glucose and galactose. 3. **Combine the Monosaccharides**: - Lactose is formed when glucose and galactose undergo a dehydration reaction, where a water molecule is released, resulting in the formation of a glycosidic bond between them. 4. **Evaluate the Options**: - (a) Glucose + Glucose: Incorrect, as lactose is not formed from two glucose molecules. - (b) Glucose + Galactose: Correct, as this combination forms lactose. - (c) Glucose + Fructose: Incorrect, as this combination does not form lactose. - (d) Fructose + Galactose: Incorrect, as this combination does not form lactose. 5. **Conclusion**: - The correct answer is option (b) glucose + galactose. ### Final Answer Lactose is formed by **(b) glucose + galactose**. ---
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