Exam (elaborations)
ANSC 326 exam 1 Questions with Complete Solution1.
- Course
- ANSC 4100
- Institution
- University Of Guelph (U Of G )
ANSC 326 exam 1 Questions with Complete Solution1.
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ANSC 326 exam 1 Questions with Complete Solutionsmicrobiology Correct Answer-artificial sub discipline of biology based
on size
food microbiology Correct Answer-studies microbes that grow in food
Louis Pasteur Correct Answer-1850 demonstrated that microbes
complete lactic and ethanol fermentation
early food preservation methods Correct Answer-probably accidental,
sun dried/salted/frozen
Fermented food became a thing around Correct Answer-4000 BCE
Robert Koch Correct Answer-Koch's postulate is about establishing a
causal relationship between a pathogen and an illness
ecology Correct Answer-studies interaction of organisms and factors in a
niche
Is food an ecosystem? Correct Answer-yes
viable vs. culturable Correct Answer-viable means alive, culturable
means detectable by testing methods
, ecology applied to microbiology Correct Answer-study of interactions
between chemical/physical/structural aspects of a niche
niche Correct Answer-could be a food product, processing surface,
biofilm (ex- water trough or water column)
MPN Correct Answer-most probable number, estimate of number of
organisms in a sample with low levels
plate counts Correct Answer-directly enumerating organisms to count
bacteria, can be found at different temperatures/atmospheres
quantitative Correct Answer-directly counting, uses 1 cell per colony
rule
qualitative Correct Answer-detection in culture (ex- salmonella present
or not)
semi-quantitative Correct Answer-an estimate (ex- MPN)
selective media Correct Answer-nourish growth of some, inhibit growth
of other microbes
D value Correct Answer-time it takes to kill 90% of the population or
reduce by 10 fold (1D=90% reduction in population), measure of heat
resistance in spores
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