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Bioc 311: Phytochemistry Question Paper

Bioc 311: Phytochemistry

Course:Bachelor Of Science In Biochemistry

Institution: Laikipia University question papers

Exam Year:2016

LAIKIPIA UNIVERSITY

UNIVERSITY EXAMINATIONS
2015/2016 ACADEMIC YEAR
THIRD YEAR EXAMINATION FOR THE DEGREE OF BACHELOR OF SCIENCE
BIOC 311: PHYTOCHEMISTRY

(MAIN CAMPUS)

STREAM: B.SC (BIOC) TIME: 2 HRS
DAY: WED. (2:30 A.M -4:30 P.M) DATE: 14/12/2016

THIS QUESTION PAPER CONSISTS OF THREE(3) PAGES. PLEASE DO NOT OPEN UNTIL THE INVIGILATOR SAYS SO.

(LAIKIPIA UNIVERSITY IS ISO 9001.2008 CERTIFIED)

VISION: A UNIVERSITY FOR VALUED TRANSFORMATION OF SOCIETY.
MISSION: TO SERVE STUDENTS AND SOCIETY THROUGH RESEARCH, EDUCATION, SCHOLARSHIP, TRAINING, OUTREACH AND CONSULTANCY.

(PAGE 1 OF 3)
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INSTRUCTIONS: THIS PAPER CONSISTS OF TWO SECTIONS A AND B. ANSWER ALL QUESTIONS IN SECTION A AND ANY TWO QUESTIONS
IN SECTION B.

SECTION A: ANSWER ALL QUESTIONS(50MRKS)

Question One:
a.) Define the followinf terms:
i.) Secondary metabolism ii.) pseudoalkaloids iii.) Allelochemicals (3mrks)
b.) Briefly explain the mode of action of saponins (3mrks)
c.) Describe the two categories of tannins (4mrks)

Queston Two:

a.) Describe the biosynthesis of quinine from strictocidine. (5mrks)
b.) How do pyrethrins qualify as insecticides? (5mrks)

Question three:

a.) Distinguish between true resins and lignans (4mrks)
b.) Describe the polyketide sysnthesis of quinones. (6mrks)

Question Four:

a.) Briefly describe tyrosine derived alkaloids. (4mrks)
b.) Citing examples, describe the mode of action of naphthaquinones (6mrks)

Question Five:

a.) What role do alkaloids play in the regulation of dpindle microtubules? (6mrks)
b.) Briefly describe the squalene pathway for sterol biosynthesis. (4mrks)

SECTION B: ANSWER ONLY ONE QUESTION (20MRKS)

Question Six:

a.) With examples, discuss regulation of acetylcholine esterase as a mode and action of
alkaloids (10mrks)
b.) Discuss the role of secondary metabolites in the insecticide industry. (10mrks)

Question Seven:

a.) Describe the major building blocks in the biosynthetic pathways of secondary metabolites. (10mrks)
b.) Discuss the role of secondary metabolites in pharmaceutical biochemistry. (10mrks)

Bioc 311: Phytochemistry Question Paper

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