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Environmental Biochemistry I Question Paper

Environmental Biochemistry I

Course:Bachelor Of Science In Environmental Health

Institution: Kenyatta University question papers

Exam Year:2008

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2007/2008
SUPPLEMENTARY/SPECIAL EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE (ENVIRONMENTAL HEALTH)
HEH 201: ENVIRONMENTAL BIOCHEMISTRY I
DATE: Tuesday 7th October 2008___________________TIME: 3.00pm – 5.00pm
=============================================================================
INSTRUCTIONS: Attempt questions in Section A and any 3 questions in Section B.
Question 6 in Section B is Compulsory

Section A:
Q1. Outline any three reasons why glycolytic intermediates are phosphorylated.
[3 marks]

Q2. Distinguish between salting in and salting out of proteins. [3 marks]

Q3. For each of the vitamins shown below, state one coenzyme and one deficiency
symptom. [3 marks]
(i) B2
(ii) Niacin
(iii) B1

Q4. Briefly state six differences between respiration and fermentation reactions.
[3 marks]

Q5. Write short notes on competitive enzyme inhibitors. [3 marks]

Section B:
Q6.(a) Giving one example in each case, write short notes on substrate level and
oxidative phosphorylations. [5 marks]

(b) Explain any four mechanisms used by cells to regulate their metabolic
activities. [8 marks]

(c) With specific examples, describe the classification of enzymes based on
enzyme commission system of nomenclature. [7 marks]

Q7. (a) With the help of a well-labelled diagram, describe the process of sulphur
cycle. [12 marks]
(b)Outline any three harmful effects of interference with nitrogen cycle.[3 marks]

Q8.Describe the fate of pyruvate following glycolysis. [15 marks]

Q9.Outline any four (4) structural differences between DNA and RNA. [4 marks]

Q10. Citing examples, discuss the role of biotechnology in environmental maintenance.
[15 marks]

Q11. (a) Explain the following terms with respect to amino acid catabolism.
(i) Transamination. [3 marks]
(ii) Oxidative deamination. [2 marks]
(b) Describe how urea is formed in humans. [10 marks]

Environmental Biochemistry I Question Paper

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