UNIVERSITI TUNKU ABDUL RAHMAN
CENTRE FOR FOUNDATION STUDIES
FOUNDATION IN SCIENCE
FUNDAMENTALS OF CELL BIOLOGY
BIOLOGICAL MOLECULES I
1. Standard answers are not encouraged. Discuss with the students and lead them to the correct answer.
2. Allow and push the students to express and explain the answers, at the same time, correct their mistakes or concepts.
3. If the tutorial questions are not yet covered in the lecture, it should be carried forward to the next tutorial.
[Source: Final Examination for Sept 2013]
Q1. Figure 1 shows the formation of one molecule of sucrose from its monomers, glucose and fructose.
(a) Based on Figure 1, state the name of process for the synthesis of sucrose and specific the name of linkage formed. (2 marks)
(b) Both monomers of sucrose are reducing sugars. Explain why sucrose is non-reducing sugar. (1 mark)
(c) Both cellulose and starch are synthesized in plants from glucose. Briefly describe how the shape of cellulose and starch is advantageous to their function. (4 marks)
[Source: Final Examination for Apr 2012]
Q2. (a) Starch is a storage polysaccharide that is produced when photosynthesis occurs in a plant cell. Figure 2.1 shows the structure of α-glucose and β-glucose.
Show how TWO glucose monomers are joined together in an unbranched part of the starch molecule. Label specifically the bond formed. (4 marks)
(b) Figure 2.2 shows part of a chitin molecule which is the major component of fungal cell walls.
Name specifically the bond between these monomers. (1 mark)
[Source: Final Examination for Jan 2014]
Q3. Cellulose is made of one type of monomers. The monomers are held together by bonds. Figure 3 shows parts of three cellulose molecules in a cell wall....