Biology
Biology
12th Edition
ISBN: 9780134813448
Author: Audesirk, Teresa, Gerald, Byers, Bruce E.
Publisher: Pearson,
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Chapter 2, Problem 1AC

Detergents help clean by dispersing fats and oils in water so that they can be rinsed away. What general chemical structures (for example, polar or nonpolar parts) must a soap or detergent have, and why?

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A mixture of lipids is applied to a silica gel column (a column chromatography), and the column is then washed with increasingly non-polar solvents. The mixture consists of phosphatidylserine, phosphatidylethanolamine, phosphatidylcholine, cholesteryl palmitate (a sterol ester), sphingomyelin, palmitate, n-tetradecanol, triacyglycerol, and cholesterol. In what order will the lipids elute from the column? Explain the reasons for your answer(s).
Tetrabromofluorescein is a purple dye often used in lipsticks. if the dye is purple, what color does it absorb?
For each of the following chemicals, name the general class they belong to, discuss their solubility in water and explain why they are/are not soluble in water: a) CH3(CH2)26COOH b) KCl c) CH3

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