Lab quiz: Food Microbiology

Question 1

heterophic plate count or (aerobic plate count)

Answer 1

determine the number of viable miccroorganisms on a sample

Question 2

colony-forming units (CFUs)

Answer 2

used to count the number of viable cells in a bacterial stock

Question 3

What are some limitations of the heterophic plate count?

Answer 3

1.) the media used is not selective, which means that many types of microorganisms can grow (including those that are not pathogenic as well as some yeasts and molds)
2.) the environment used to culture the assay plates may be unfavorable for the growth of certain organisms (such as strict anaerobes)

Question 4

pour plate method

Answer 4

a common technique used to determine microbial counts in a liquid sample

Question 5

TNTC

Answer 5

Too numerous to count (range is from 25-250, over 250 means it’s TNTC)