To test for lipids, when we put one drop of corn oil on a paper towel (positive control): what opacity (translucent or opaque) did you observe in the paper towel? Does that mean the substance is present or absent? To test for lipids, when we put one drop of distilled water on a paper towel (negative control): what opacity (translucent or opaque) did you observe in the paper towel? Does that mean the substance is present or absent? What is the purpose of having controls when testing for lipids in this experiment?

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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NOTE: translucent (positive for fats) and opaque (negative for fats)

  1. To test for lipids, when we put one drop of corn oil on a paper towel (positive control): what opacity (translucent or opaque) did you observe in the paper towel? Does that mean the substance is present or absent?
  2. To test for lipids, when we put one drop of distilled water on a paper towel (negative control): what opacity (translucent or opaque) did you observe in the paper towel? Does that mean the substance is present or absent?
  3. What is the purpose of having controls when testing for lipids in this experiment?
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