The monomer units in starch are:
Correct answer: D. α -D glucose
- A. Pyranose fructose
- B. β -D glucose
- C. Furanose
- D. α -D glucose
Explanation
The correct answer is α-D-glucose. Starch is a polysaccharide made up of glucose monomers. Specifically, it is composed of α-D-glucose units linked together. The α designation refers to the orientation of the hydroxyl group on the anomeric carbon which is important for the structure and function of starch. Other options like pyranose fructose, β-D-glucose, and furanose do not represent the monomer units of starch. Pyranose fructose and furanose are related to different sugar structures, while β-D-glucose is a different anomer of glucose not used in starch.
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