Biology 9700 · AS & A Level · Testing for biological molecules

Testing for biological molecules — practice question

Starch consists of two polysaccharides, amylose and amylopectin. Fig. 3.1 illustrates a molecule of α-glucose before it joins the end of an amylose molecule.
(a(i))[3]

Complete Fig. 3.1 so it shows how a molecule of α-glucose is joined to amylose.

(a(ii))[1]

Name the bond that links glucose molecules in polysaccharides, such as amylose.

(b)[3]

Glycogen and cellulose are two additional polysaccharides. Complete Table 3.1 to compare glycogen and cellulose with amylose.

(c(i))[3]

Explain how acarbose inhibits these membrane-bound enzymes.

(c(ii))[2]

Suggest why acarbose can be used to treat people with type 2 diabetes.

Worked solution & mark scheme

This 12-mark question has a full step-by-step worked solution and mark scheme. One marking point: H and OH removed correctly to make water

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