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04-BS-13: December 2013

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 Ethanol Production by Yeast — Actual vs. Thermodynamic-Maximum Yield
  2. Question 2 Effect of Cell Growth on Oxygen Demand — Ethanol to Acetic Acid
  3. Question 3 Baker's Yeast Fermenter — Rate of Heat Removal
  4. Question 4 Yeast Growth on Glucose — Yield Coefficients and Oxygen Requirement
  5. Question 5 Bioreactor Design Data and Operating-Mode Selection
  6. Question 6 Gross Cell Structure and Its Effect on Downstream Processing
  7. Question 7 Hairy-Root Culture Kinetics — Specific Growth Rate, Sugar Uptake and Yield
  8. Question 8 Listeria Growth Curve Under Modified Temperature, Water Activity and Atmosphere
  9. Question 9 Diauxic Growth of E. coli on a Glucose:Lactose Medium
  10. Question 10 Bacterial Cell Wall Structure, Virus Comparison, and Pure Culture

Start with Question 1 →

National Exams — December 2013 — 04-BS-13, Biology. Three-hour, closed-book exam (one double-sided aid sheet permitted, approved Casio/Sharp calculator allowed). Format: Part I offers 6 questions (any 3 constitute a complete answer, 20 marks each) and Part II offers 4 questions (any 2 constitute a complete answer, 20 marks each) — a full paper is 5 questions. All 10 are solved below for completeness. Most questions require an essay-format answer; Q1–Q4 and Q7 are calculation questions.

Reference texts: Shuler & Kargi, Bioprocess Engineering: Basic Concepts (2nd ed., Prentice Hall) — elemental/electron balances, yield coefficients, fermenter energy balances, growth kinetics; Madigan et al., Brock Biology of Microorganisms (15th ed., Pearson) — bacterial/viral morphology, physiology and growth control; Toledo, Fundamentals of Food Process Engineering (3rd ed., Springer) — plant/animal tissue structure.