Question

1. the side - bonds that link across the polypeptide chains are responsible for hairs strength and _. a) pigment b) elasticity c) luster d) direction
2. what are the three types of side bonds? a) hydrogen, carbon, and disulfide b) hydrogen, salt, and nitrogen c) hydrogen, salt, and disulfide d) helix, salt, and disulfide
3. the side bonds account for about _ of hairs overall strength. a) 1/2 b) 1/3 c) 1/4 d) 1/10
4. which of the following is a weak physical bond? a) hydrogen b) disulfide c) side d) end - to - end
5. how can a hydrogen bond be broken? a) during vigorous brushing. b) by a change in ph, such as from the application of strong alkaline or acidic solutions c) by water or heat, such as during wet and thermal styling d) it cannot be broken.
6. how can a salt bond be broken? a) during vigorous brushing b) by a change in ph, such as from the application of strong alkaline or acidic solutions c) by water or heat, such as during wet and thermal styling d) it cannot be broken.

Explanation:

1. The three types of side - bonds in hair are hydrogen, salt, and disulfide bonds.
2. Side bonds account for about 1/3 of hair's overall strength.
3. Hydrogen bonds are weak physical bonds.
4. Hydrogen bonds can be broken by water or heat, such as during wet and thermal styling.
5. Salt bonds can be broken by a change in pH, such as from the application of strong alkaline or acidic solutions.

Answer:

1. D. hydrogen, salt, and disulfide
2. B. 1/3
3. A. hydrogen
4. C. by water or heat, such as during wet and thermal styling
5. B. by a change in pH, such as from the application of strong alkaline or acidic solutions