Campbell Biology (11th Edition)

Published by Pearson
ISBN 10: 0-13409-341-0
ISBN 13: 978-0-13409-341-3

Chapter 41 - Test Your Understanding - Level 3 - Synthesis/Evaluation - Page 918: 11


Keratinized cells, as those in hair, are dead and are not easily modified.

Work Step by Step

Application of protein to the hair can change its feel, but simply touching protein to the hair is not sufficient. Keratin treatments for hair involve a lengthy application of protein along with other chemicals and heat treatments to alter the hair shaft. A protein shampoo would not be very effective since the protein would only briefly be in contact with the hair before the majority would be washed off. Additionally, the accessory chemicals needed to create a greater impact would not be present in a shampoo.
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