Chemical Composition of Hair

What is the primary composition of hair?

• Water

• Peptides

• Amino acids

• Keratinized protein

What process do cells undergo as they move up the hair follicle?

• Oxidation

• Keratinization

• Hydrolysis

• Polymerization

What percentage of the hair fiber is made up of protein?

• 75%

• 80%

• 90%

• 100%

Which of the following is NOT one of the COHNS elements?

• Sulfur

• Iron

• Oxygen

• Carbon

What are peptides in the context of hair structure?

• A form of keratin

• A type of hair cell

• A type of side bond

• Links that bond amino acids together

Which type of bond in hair is easily broken by water or heat?

• Peptide bonds

• Disulfide bonds

• Salt bonds

• Hydrogen bonds

What is the effect of alkaline or acidic products on salt bonds in hair?

• They permanently break the bonds

• They strengthen the bonds

• They temporarily break or weaken the bonds

• They have no effect

Which type of bond gives hair its strength, elasticity, and molding ability?

• Peptide bonds

• Hydrogen bonds

• Salt bonds

• Disulfide bonds

What determines the curl configuration or coil pattern of the hair?

• The hair's density

• The hair's texture

• The hair's length

• The hair's color

Which hair type is known for having great texture range from soft waves to wiry tresses?

• Asian

• Caucasian

• African

• Native American