NATIONAL OPEN UNIVERSITY OF NIGERIA
14/16 AHMADU BELLO WAY, VICTORIA ISLAND, LAGOS
SCHOOL OF SCIENCE AND TECHNOLOGY
MARCH/APRIL 2014 EXAMINATION
COURSE CODE: CHM315
COURSE TITLE: CARBOHYDRATE CHEMISTRY
TIME ALLOWED: 2 HOURS
INSTRUCTION:ANSWER 4 QUESTIONS ONLY
1 (a) Define Carbohydrates (3marks)
(b) State four functions of Carbohydrates (8marks)
(c) Differentiate between Aldoses and Ketoses giving an example of each and their chemical structures. (6½marks)
2. (a) Highlight four chemical properties of carbohydrates (8 marks)
(b) Write the structure of the following monosaccharides
(i) Galactose (ii) Glucose (5½marks)
(c) Using structures differentiate between amylase and amylopectin (4 marks)
3. (a).Distinguish between cotton and starch using their structural and physical characteristics. (10marks) (b) Name four structural carbohydrates found in animals and state their composition. (7½marks)
4. (a) What are glycoproteins ? (7marks) (b) How do they differ from proteoglycan? (4marks) (c) Pectin is a heteropolysaccharides in plant tissues. Justify this statement (6½marks)
5. (a) Write briefly on the chemical reactions of monosaccharides (10marks).(b) What are epimers? Give three examples (5marks) (c) What are asymmetric centres.(2½marks)
6.(a)i Differentiate between reducing and non-reducing sugars.(ii) Give an example of each (10 marks) (b)Explain the term mutarotation (5 marks) (c) Mention two ways of presenting the chemical structure of monosaccharide (2½marks)
For the 2015 – till date past questions for this course CLICK HERE
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