Starch is a polymer of:
Correct answer: B. α--glucose
- A. β-D-glucose
- B. α--glucose
- C. γ-D-glucose
- D. α-L-glucose
Explanation
Starch is a polysaccharide composed of repeating units of alpha-glucose molecules joined together through glycosidic bonds. It is the principal energy storage carbohydrate in plants, and is commonly found in grains, potatoes, and other starchy vegetables. The alpha-glucose molecules in starch can be arranged in two forms: amylose, which is a linear chain of alpha-glucose molecules linked by alpha-1, 4-glycosidic bonds, and amylopectin, which is a branched chain of alpha-glucose molecules linked by alpha-1, 4-glycosidic bonds and alpha-1, 6-glycosidic bonds.
This question appeared on the UHS MDCAT 2012 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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