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Bioc 415: Biochemistry Of Plants Question Paper

Bioc 415: Biochemistry Of Plants

Course:Bachelor Of Science In Biochemistry

Institution: Egerton University question papers

Exam Year:2013

SECTION A: ANSWER ALL QUESTIONS

1. (a) List four biological activities of cytokinins. (4 Marks)
(b) Distinguish between the following terms: (8 Marks)
(i) cyclic electron transport and non-cyclic electron transport
(ii) Glyceroglycolipids and glycerophospholipids
(iii) Anthocyanins and anthocyanidins

2. (a) Explain the mode of actions of: (4 Marks)
i. Paraquat
ii. Diuron
(b) Give a brief outline of the process involved in the assimilation of mineral nitrogen in he leaf. (3 Marks)
(c) Which roles do the oxidative pentose phosphate pathways play in a plant metabolism (4 Marks)

3. (a) Give a brief outline to show the breakdown of cynogenic glycosides in plants to release the volatile
gas hydrogen cyanide (HCN) (3 Marks)
(b) Expand the term allelopathy and name secondary matabolites responsible or the effect of allelopathy. (4 Marks)

4. (a) Give a detailed account of the Z scheme of photosynthesis including their ultimate products. (6 Marks)
(b) Explain how light controls the activity of he enzymes (4 Marks)
i. Fructose-1,6-bisphosphatease
ii. Rubisco

SECTION B: ANSWER THREE QUESTIONS ONLY

5. Describe the process of conversion of storage lipids into sucrose in germinating seeds. (10 Marks)

6. (a) Describe the sulfate assimilation process from reduction of sulfate to cysteine. (8 Marks)
(b) Explain what happens to plants under prolonged exposure (more than 8hrs) to high atmospheric
concentrations of sulphur dioxide greater than 0.3ppm. (2 Marks)

7. Discuss the role of terpens in defence against herbivores in many plans (10 Marks)

8. Give a detailed account of the pentose phosphate pathway. (10 Marks)

9. Describe the reaction of the C2 oxidative photosynthesis carbon cycle. (10 Marks)

Bioc 415: Biochemistry Of Plants Question Paper

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