Question Description
Lesson 3
Answer the following questions related to the case study (Sweet Truth: Not all Carbohydrates are Alike)
The case study is attached
Questions
1. In aqueous solutions there are three forms of glucose: the -form (36%), the -form (64%) and a trace amount
of the open-chain form. At equilibrium, the alpha and beta cyclic forms are interconverted by way of the openchain
structure. Explain (a) why the cyclic forms exist predominately in solutions, and (b) why the -form is
more abundant than the -form.
2. Name the monosaccharides and disaccharides in amylose and cellulose. Compare the structural and
conformation diff erences between amylose and cellulose. A simple iodine test can be used to distinguish the two
polysaccharides. Describe the iodine test and explain the observation.
3. Write the reduction reaction of glucose to form sorbitol. List and explain the side eff ects caused by too much
sorbitol consumption.
4. Blood sugar levels can be detected by test strips, which are coated with glucose oxidase and an indicator. Write
the oxidation reaction of glucose that happens in the testing process.
5. Why are soluble fi bers identifi ed as prebiotics?
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