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04-BS-13: December 2019

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

  1. Question 1 Morphology of Plant and Animal Material — Relation to Handling and Processing
  2. Question 2 Continuous Stirred-Tank Fermenter — Unsteady-State Cell Balance
  3. Question 3 Heat of Reaction for Fumarase-Catalyzed Malate→Fumarate Conversion
  4. Question 4 Single-Cell Protein from Hexadecane — Stoichiometry and Yield Coefficients
  5. Question 5 Cellulomonas SCP from Glucose — Actual vs. Maximum Theoretical Yield
  6. Question 6 Aerobic Growth of S. cerevisiae on Ethanol — Stoichiometry from RQ
  7. Question 7 Bacterial Classification, Fungal Spores, and Plasmids
  8. Question 8 Listeria Growth Curve — Effect of Temperature, Water Activity, and MAP
  9. Question 9 Batch Growth Kinetics from Two Semilog Data Points

Start with Question 1 →

National Exams — December 2019 — 04-BS-13, Biology. Three-hour, closed-book exam (one double-sided aid sheet permitted, approved Casio/Sharp calculator allowed). Format: Part I offers 20-mark questions with an instruction to "solve 3 questions only out of the following 5 questions" — but six questions (Q1–Q6) are actually printed under Part I, one more than the instruction text states (an inconsistency in the paper itself). Part II offers 3 questions (any 2 constitute a complete answer, 20 marks each). All nine questions are solved below for completeness using the exam's own numbering (Q1–Q6 = Part I, Q7–Q9 = Part II, no renumbering needed). Q2, Q3, Q4, Q5, Q6, and Q9 are calculation/stoichiometry questions; Q1, Q7, and Q8 are essay/qualitative questions.

Reference texts: Shuler & Kargi, Bioprocess Engineering: Basic Concepts (2nd ed., Prentice Hall) — elemental/electron balances, yield coefficients, fermenter mass balances, respiratory quotient, batch growth kinetics; Madigan et al., Brock Biology of Microorganisms (15th ed., Pearson) — bacterial classification, fungal spores, plasmids, water-activity/temperature effects on growth; Toledo, Fundamentals of Food Process Engineering (3rd ed., Springer) — plant/animal tissue morphology and processing.