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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)
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