University:
McMaster University
Course:
Molecular Biology 3Y03 | Plant Responses to the environment
Academic year:

2024
Views:

402

Pages:

2
Author:

Anonymous TDM

Name:ID Number:Biology 3Y03Plant Responses to the EnvironmentDay ClassDr. R. CameronDuration of Exam: 3 hoursMcMaster University Final ExamDecember 12, 2007This Examination Paper includes 2 pages and 5 questions. You areresponsible for ensuring that your copy of the exam is complete.Bring any discrepancy to the attention of your invigilator.Calculators are NOT allowed.Please Print your Name and Student Number on theExam Paper and the Exam Booklets that you use.Special Instructions:1. No aides are allowed.2. Answer all 5 questions in the exam booklets provided.3. Essay, point form or diagrams may be used.4. The exam is worth 50 marks, the mark assigned for each question isindicated in brackets.5. The examination counts for 33% of your final grade.Examination Questions1. Define Gene Silencing, including the sources of dsRNA, thena. Explain using diagrams/text and relevant evidence how siRNAs, Dicer andRISC are thought to participate in Gene Silencing.b. Explain the difference between RNAi- silenced and anti-sense plants.(10 marks)Page 1 of 2 BIOLOGY 3Y03 McMASTER UNIVERSITY FINAL EXAMINATION2. Describe Systemic Acquired Resistance, then discuss and explain:a. The evidence that implicates DIR1 in long distance signaling duringSAR.b. The evidence (2 key experiments from Tutorial #3) that stronglysuggests that methyl salicylate is one of the long distance signalsduring SAR.(10 marks)Bonus Question - Devise a new SAR model that includes both DIR1 andmethyl salicylate.(5 marks)3. Discuss and explain the role of the Florigen long distance signal, CO, thecircadian clock and FT in the initiation of the flowering signaling pathway.Include relevant experimental evidence in your answer.(10 marks)4. Compare and contrast the Drought and Ozone stress responses bydescribinga. the detrimental effects these stresses have on plants.b. the plant response to tolerate or resist these responses10.marks)5. A lively debate about the possible benefits and consequences of the use ofgenetically modified crops is occurring right now in many parts of the world.Compare and contrast the potential benefits with the potentialdetrimental consequences of the use of this technology.Include your own opinion on this topic backed up by relevant information fromthe course. In other words, do you think the benefits outweigh the risks?Include at least 6 examples in your answer (all beneficial or all detrimentalor a mix of the two).(10 marks)THE ENDPage 2 of 2

Biology 3Y03 - Exam 1 Fall 2007

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