Becker's World of the Cell 9th Edition by Lewis Kleinsmith, Jeff Hardin, Gregory Paul Bertoni

Exercise 6

The "Permanent" Wave That Isn't. The "permanent" wave that your local beauty parlor offers depends critically on rearrangements in the extensive disulfide bonds of keratin that give your hair its characteristic shape. To change the shape of your hair (that is, to give it a wave or curl), the beautician first treats your hair with a sulfhydryl reducing agent, then uses curlers or rollers to impose the desired artificial shape, and follows this by treatment with an oxidizing agent.
(a)What is the chemical basis of a permanent Be sure to include the use of a reducing agent and an oxidizing agent in your explanation.
(b)Why do you suppose a permanent isn't permanent (Explain why the wave or curl is gradually lost during the weeks following your visit to the beautician.)
(c)Can you suggest an explanation for naturally curly hair