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22-Agric-A7 Chemistry and Microbiology of Foods: December 2013

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

  1. Question 1 Reaction-Order Kinetics in Food Processing
  2. Question 2 Non-Enzymatic Browning and Bubble Rise in Beverages
  3. Question 3 Controlling and Measuring Water Activity
  4. Question 4 Amorphous Sugar States and Moisture Migration
  5. Question 5 Protein Denaturation Temperature and Rancidity Control
  6. Question 6 Fat Modification and Melting Behaviour
  7. Question 7 Browning/Foam Definitions and Meat Pigment Chemistry
  8. Question 8 Thermal Process Lethality and the Bacterial Growth Curve
  9. Question 9 Metabolites and Growth Factors in Food Microbiology
  10. Question 10 Comparative Spoilage Rates and Listeria monocytogenes
  11. Question 11 HACCP for Milk Pasteurization
  12. Question 12 Food Safety Risk Priorities and the Hurdle Concept
  13. Question 13 Irradiation, Glove Use, and Egg Defence Structures
  14. Question 14 Multiple Choice — Food Safety and Microbiology

Start with Question 1 →

Paper format. 04-Agric-A7 Chemistry and Microbiology of Foods, National Exams December 2013 — a three-hour closed-book exam (approved Casio/Sharp calculator permitted; one aid sheet, both sides). The paper is in two sections: Section I (Food Chemistry, Questions 1–7) and Section II (Food Microbiology, Questions 8–14); candidates answer any four questions from each section for a 100-mark paper (each question worth 12.5 marks). All fourteen questions are worked here so the set is a complete study resource.

Reference texts. S. Damodaran, K.L. Parkin and O.R. Fennema (eds.), Fennema's Food Chemistry, 5th ed. (Maillard/enzymatic browning, water activity and sorption isotherms, lipid oxidation and rancidity, sucrose glass transition, protein denaturation at interfaces, myoglobin chemistry); R.P. Singh and D.R. Heldman, Introduction to Food Engineering, 5th ed. (reaction kinetics in food processing, thermal process lethality); J. Jay, M. Loessner and D. Golden, Modern Food Microbiology, 7th ed. (microbial growth curve, intrinsic/extrinsic factors, Listeria monocytogenes, food preservation hurdles, irradiation, spoilage patterns); C. Mortimore and C. Wallace, HACCP: A Practical Approach, 3rd ed. (CCP identification/monitoring/verification for milk pasteurization).

Section I — Food Chemistry