Which of these is not a disaccharide?
Correct answer: A. Fructose
- A. Fructose
- B. Sucrose
- C. Lactose
- D. Maltose
Explanation
Option A: Fructose is not a disaccharide. Disaccharides are carbohydrates that are composed of two monosaccharides joined together by a glycosidic bond. Fructose is a monosaccharide, so it cannot be a disaccharide. Option B: Sucrose is composed of glucose and fructose. The formula for sucrose is C12H22O11. Option C: Lactose is composed of glucose and galactose. The formula for lactose is C12H22O11. Option D: Maltose is composed of two glucose molecules. The formula for maltose is C12H22O11.
This question appeared on the NUMS 2018 paper, which you can sit online with every answer explained.
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About Carbohydrates
Carbohydrates are organic compounds classified as monosaccharides, disaccharides and polysaccharides according to their structure and hydrolysis products. The topic covers glycosidic bonds, glucose and fructose, sucrose, lactose and maltose, starch, glycogen and cellulose, along with their roles in energy storage, structural support and food tests.
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