Biology

Topics: Carbohydrate, Glucose, Molecule Pages: 4 (523 words) Published: June 20, 2013
TUTORIAL 1
BASIC MOLECULES OF CELLS I

Student’s Guide:
At university level, the tutor facilitates student learning without spoon-feeding. Therefore, you are expected to:

• Read your textbook, attempt the questions before the tutorial • You may enter the class and sign your attendance after showing your tutor that all tutorial questions have been completed; even if you don’t know how to do, write something - you’re not advised to leave answers blank in the finals. • Write answers on board if you wish to receive tutor feedback (no answer, no feedback)

• Be independent: consult textbooks or dictionaries on your own first before asking the tutor • All questions are compulsory. 1 mark may reflect 1 answer point. (No half mark is awarded in the finals marks)

(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.

[pic]
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.

[pic]

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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