MT2-W10 - FST 104 Winter 2010 Midterm #2 (March 3, 2010)...

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1 FST 104 Winter 2010 Name______________________________ Midterm #2 (March 3, 2010) Student ID #________________________ PLEASE RECORD YOUR TEST VERSION LETTER (shown on page 6 of the exam) and the correct answers to questions 1-33 on a blue Scantron form UCD 2000 using a #2 pencil. (If you did not bring the Scantron form, circle the letter of the correct answer directly on the exam pages. We will grade your exam by hand and assess a penalty of ten points.) MICROBIAL CHARACTERISTICS. For questions 1-4, chose the correct letter of the group of microorganisms from the list given immediate below. A letter may be used more than once. [3 points each] A. Pseudomonas & relatives B. Enteric Family & relatives C. Endospore-forming bacteria D Lactic Acid bacteria E. Molds 1. Some members of this group have no obvious enzymes to protect themselves against the toxic effects of oxygen. 2. One member of this group can produce "fruity" spoilage in some refrigerated foods due to the formation of esters from fats. 3. Some members of this group produce cellulases. 4. Members of this group could cause souring of a fruit juice with an initial pH of 4.0. MULTIPLE CHOICE [3 points each] 5. Which of the following is not true of Erwinia ? A Causes “soft rot” of vegetables B It is a member of the Enteric family C Secretes pectinases D Secretes cellulases E None of the above 6. What is the usual aim of a pasteurization treatment? A To kill the most numerous microbe present B To kill the most heat sensitive microbe C To kill 5 log cycles of the microbial population D To kill 5 log cycles of all spores E To kill the most resistant problematic organism in that food 7. Which of the following is a false statement regarding Intermediate Moisture Foods (IMF): A IMF foods have an a w in the range of 0.60 to 0.85 B No pathogen or spoilage organism can grow in IMF C IMF can be made by blending traditional ingredients such as chocolate or honey D Use of humectants such as glycerol or sorbitol in IMF bind water without giving the sensation of dryness E No other treatment to IMF is needed to prevent the growth of dangerous anaerobes such as C. botulinum
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2 8. As you raise the oxidation reduction potential (redox) from -400 to +800 mV, which of the following would be the first to die? A Bacillus cereus B Listeria monocytogenes C Escherichia coli O157 H7 D Aspergillus flavus E Clostridium perfringens 9. The form of chlorine that is most effective as an antimicrobial agent and the pH at which it is the predominant form. A
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This note was uploaded on 03/29/2010 for the course FST FST 104 taught by Professor Carold'lima during the Winter '10 term at UC Davis.

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MT2-W10 - FST 104 Winter 2010 Midterm #2 (March 3, 2010)...

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