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Food Biochemistry Question Paper

Food Biochemistry

Course:Bachelor Of Science In Food, Nutrition And Dietetics

Institution: Kenyatta University question papers

Exam Year:2009

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2009/2010
FIRST SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE IN FOODS, NUTRITION AND DIETETICS
HFN 304: FOOD BIOCHEMISTRY

DATE: Wednesday 23rd December, 2009 TIME: 2.00 p.m. – 4.00 p.m.

INSTRUCTIONS
Answer ALL questions.

QUESTION ONE
a) Some amino acids are essential while others are not. Which are the essential ones and why?
[10 marks]
b) During food processing, the quality of a protein may be reduced.
(i) What is protein quality? [5 marks]
(ii) How is protein quality reduced? [5 marks]

QUESTION TWO
a)
(i) What do you understand by hydrolysis? [2 marks]
(ii) Explain what is meant by condensation. [2 marks]
(iii) Give one example of 2 (a) (ii). [1 mark]

b) What is gelatinization? [5 marks]

c) What is retrogradation? [5 marks]

d) Give any four differences between amylase and amylopectin. [5 marks]

QUESTION THREE
a) Amylose and cellulose are both straight chain polymers of glucose. Explain why one is digestible while the other is not.
[4 marks]
b) The Liver has a prominent role to play in the metabolism of all the major food nutrients. Explain this statement in relation to carbohydrates,
proteins and lipids.
[6 marks]

QUESTION FOUR
a) What do you understand by the term Lipids. [2 marks]
b) How are the lipids classified? [3 marks]
c) Explain any two mechanisms of lipid deterioration. [3 marks]
d) Give one example each of how to prevent lipid deterioration in practice. [2 marks]

QUESTION FIVE
Differentiate between vitamins and hormones.
[10 marks]

Food Biochemistry Question Paper

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