The starches-amylose, amylopectin, and glycogen--are all homopolysaccharides of
ID: 511913 • Letter: T
Question
The starches-amylose, amylopectin, and glycogen--are all homopolysaccharides of a-D-glucose. Which of the following statements are true about the structure and function of the starches? A. Amylopectin is the most highly branched of the structures B. Amylose is unbranched and can adopt a helical structure D. They are stored intracellularly as insoluble granules E. Each molecule of starch has only one reducing end C. Their function is primarily as structural components of cell walls F. Glycogen contains both a (1 rightarrow 6) and alpha (1 rightarrow 4) glycosidic bondsExplanation / Answer
All the options (A,B,C,D,E and F)are right.
Starch and glycogen are all polymers of glucose. They differ in the type of glucose present and the bonds which link through glucose monomers together.
Starch and glycogen are made from alpha-glucose. This is an isomer of glucose in which the hydroxyl (-OH) group attached to carbon number 1 is below the plane of the ring. Starch present is plant cells where as Glycogen present in Animal cells asana energy source.
Amylopectin is a water soluble polysaccharide and highly branched polymer of glucose found in plants. Glucose units are linked in a linear way with (14) glycosidic bonds. Branching takes place with (16). Amylose is a helical polymer made of -D-glucose units, bonded to each other through (14) glycosidic bonds. Glycogen is similar in structure to amylopectin, but branches more frequently. Amylopectin, like -amylose, is composed entirely of -glucose, its -glucose residues are joined not only in (14) linkages but also at (16) branch points. Branches occur at every twelve to thirty residues along a chain of (14) linked glucoses. As a result, amylopectin has one reducing end and many nonreducing ends. Amylopectin and -amylose are broken down by the enzyme amylase.
Due to one anomeric carbon end in starch they have only one reducing agent.
They are one of the primary components in cells.
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