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Afs2204:Food Microbiology Question Paper

Afs2204:Food Microbiology

Course:Bachelor Of Science In Food Science And Nutrition

Institution: Meru University Of Science And Technology question papers

Exam Year:2012

QUESTION ONE – 30 MARKS
(a) Briefly discuss how an understanding of the microbial sources in food can be of help to a food microbiologist. (4Marks) (b) When identifying microorganisms, why should a wet mount be used while making measurements? (2 Marks) (c) During an objective calibration exercise the following observations were made under the x40 objective. 40 spaces on the ocular micrometer = 10 spaces on the stage micrometer. The stage micrometer has 1mm divided into 100 equal space divisions. If the length of a micro-organism is 2 ocular units under the x40 objective, calculate its dimensions in m. Show your calculations. (5Marks) (d) Many vegetables are eaten raw. Discuss the microbiological concerns consumers should have when consuming them. (5Marks) (e) List and discuss three important factors that differentiate food borne infections from food-borne intoxication and give an example of each. (6Marks) (f) Explain the purpose of establishing microbial criteria for foods and outline the information that should be contained therein. (8Marks)
QUESTION TWO – 20 MARKS
(a) Discuss five intrinsic factors that influence the ability of foods to support the growth of microorganisms. (20Marks)
2
QUESTION THREE – 20 MARKS
(a) List and briefly explain six conditions that should be considered in selecting an indicator of enteric pathogens. (12Marks) (b) Briefly explain the gram staining procedure. (8Marks)
QUESTION FOUR – 20 MARKS Write short notes on four commonly used chemical sanitizers approved for use in the food industry.
(20Marks)
QUESTION FIVE – 20 MARKS
(a) Discuss the food association of and preventive measures against the causative pathogen linked to campylobacteriosis. (6Marks) (b) Briefly discuss the components of risk assessment as applied within the overall risk analysis system, which is geared towards ensuring food safety. (12Marks) (c) What are the justifications of using enterobacteriaceae family as indicators of faecal contamination instead of coliforms. (2Marks)

Afs2204:Food Microbiology Question Paper

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