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Kst205: Biochemistry Of Agriculturalists Question Paper

Kst205: Biochemistry Of Agriculturalists

Course:Bachelor Of Science In Agricultural Biotechnology

Institution: Kenyatta University question papers

Exam Year:2012

KENYATTA UNIVERSITY
UNIVERSITY EXAMINATIONS 2011/2012
SECOND SEMESTER EXAMINATION FOR THE DEGREE OF BACHELOR OF
SCIENCE (PLANT IMPROVEMENT AND PROTECTION) AND BACHELOR OF
EDUCATION (SCIENCE)

KST 205: BIOCHEMISTRY OF AGRICULTURALISTS

DATE:
Thursday 29th March 2012

TIME:
2.00p.m – 4.00p.m
INSTRUCTIONS
Answer all questions in section A and any two in section B.
Section B (40 marks)
1.
a)
Show structural ring formula of D-ribose.

[2marks]
b)
Show and name the structure that is formed when hydroxyl group is replaced by
hydrogen ion at C2 and state its importance.

[3marks]
2.
Concisely demonstrate full acetal formation by plants and state the significance of this
process to agricultural crops.

[5marks]
3.
a)
Define the term mutarotation.

[1mark]

b)
Using D-glucopyranose, demonstrate the above phenomenon in (a) above

[4marks]
4.
a)
Distinguish between laevarotory and dextrorotatory.

[2marks]

b)
Compare and contrast D-glyceraldehyde and Dihydroxyacetone
[3marks]
5.
a)
Outline the physical and chemical properties of xylose.

[3marks]
Page 1 of 2

b)
Show the structural orientation of the ketonic form of sugar in (a) above.

[2marks]
6.
Draw a structure of D-glucopyranosyl-(1-4-glucopyranoside and describe its
reactions with Fehlings reagent.

[5marks]
7.
Describe electrophoresis as a technique of separating individual amino acids from protein
hydrolysates.

[5marks]
8.
Classify simple proteins on the basis of solubility properties.

[5marks]
Section B (30 marks)
9.
Describe mechanisms of regulation and inhibition of protein synthesis in higher
agricultural plants.

[15marks]
10.
Discuss properties of enzymes and enumerate factors that affect their activity.

[15marks]
11.
Describe chemical properties of lipids and highlight the significance of these properties to
both industrialists and livestock farmers.

[15marks]
12.
a)
Discuss the formation of rood nodules is a specified crop plant.
[9marks]

b)
Give account of factors that control biological nitrogen fixation.
[6marks]

Page 2 of 2

Kst205: Biochemistry Of Agriculturalists Question Paper

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