How many fecal coliforms per 100 mL are in the sample?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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A one-mile pool water sample
was tested for coliforms using
the Petrifilm test. The sample
was first diluted by transferring 5
mL into 5 ml of sterile diluent
and then one mL was tested on a
Petrifilm. The following counts
were produced:
Petrifilm results:
2 blue colonies with a gas bubble
1 blue colony without a gas
bubble
3 red colonies with a gas bubble
7 red colonies without a gas
bubble
30 dark colored colonies without
a gas bubble
How many fecal coliforms per
100 mL are in the sample?
Transcribed Image Text:A one-mile pool water sample was tested for coliforms using the Petrifilm test. The sample was first diluted by transferring 5 mL into 5 ml of sterile diluent and then one mL was tested on a Petrifilm. The following counts were produced: Petrifilm results: 2 blue colonies with a gas bubble 1 blue colony without a gas bubble 3 red colonies with a gas bubble 7 red colonies without a gas bubble 30 dark colored colonies without a gas bubble How many fecal coliforms per 100 mL are in the sample?
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