Topics: Carbohydrate, Glucose, Molecule Pages: 4 (523 words) Published: June 20, 2013

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(Source: Final examination, Apr 2013)
Q1.Sucrose is the organic compound commonly known as table sugar or saccharose. Figure 1.1 shows the structure of sucrose and the process in which sucrose is broken down into its monomers.

Figure 1.1

(i)Identify monomer X, monomer Y and process A. (3 marks)

(ii)When Benedict test was performed on sucrose, it was observed that the blue colour remained unchanged. Make a conclusion based on this observation. (1 mark)

(iii)Monomers X can undergo process B to form polysaccharide P. This polysaccharide can exist in two forms as shown in Figure 1.2.


Figure 1.2

(A)Identify polysaccharide P. (1 mark)

(B)Suggest ONE function of polysaccharide P.(1 mark)

(C)Compare polysaccharide P and cellulose in terms of their structure. Copy Table 1.1 and write the answers in your answer booklet. (4 marks)

Table 1.1
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