Question

Part 1 (1 point) See Hint Given the nature of hair and fingernails, and knowing both have high levels of keratin, which of the following is true? Choose one: O A. Keratin in hair has more cysteines and therefore fewer disulfide bonds than keratin in fingernails. B. Keratin in hair has fewer cysteines and therefore fewer disulfide bonds than keratin in fingernails. O C. Keratin in hair has more cysteines and therefore more disulfide bonds than keratin in fingernails. O D. Keratin in hair has fewer cysteines and therefore more disulfide bonds than keratin in fingernails. Part 2 (1 point) See Hint Getting your hair permed must involve which of the following? Choose one: O A. reduction of disulfide bonds, reshaping, and then oxidation of disulfide bonds O B. proteolytic digestions of keratin O C. irreversible denaturation of keratin O D. oxidation of disulfide bonds, reshaping, and then reduction of disulfide bonds

Answer 1

1. B is the right answer. Keratin has more cysteine which leads to more disulfide bonding and that leads to higher level of rigidity which is shown in case of nails and lesser cysteine and less disulfide bonding in case of hair which makes it more flexible than nails. All the other options are wrong as they do not correctly state the fact regarding keratin and disulfide bonds.

2. A is the right answer. When the hair is permed, the disulfide bonds reduced and now the cysteine amino acid is free to move and is reshaped and the an oxidizing agent is used to reverse the effect of the reducing agent used to reduce the disulfide bonds. All the other options are incorrect as they do not appropriately state what exactly happens when the hairs are permed.

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