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Multiple Choice
Which of the following is a digestible, straight-chain type of starch composed of glucose units?
A
Amylose
B
Cellulose
C
Glycogen
D
Amylopectin
Verified step by step guidance
1
Understand the question: The problem is asking for a digestible, straight-chain type of starch composed of glucose units. This requires knowledge of carbohydrate structure and function.
Review the options: Amylose, Cellulose, Glycogen, and Amylopectin. Each of these is a polysaccharide composed of glucose units, but their structures and digestibility differ.
Analyze Amylose: Amylose is a straight-chain polysaccharide made of α-D-glucose units linked by α(1→4) glycosidic bonds. It is digestible by human enzymes such as amylase.
Compare with other options: Cellulose is composed of β-D-glucose units linked by β(1→4) glycosidic bonds, making it indigestible for humans. Glycogen and Amylopectin are branched polysaccharides, not straight-chain types.
Conclude: Based on the structural and digestibility characteristics, Amylose is the correct answer as it is a digestible, straight-chain type of starch composed of glucose units.