Chemical Texture Services (Cosmetology) Test A

Chemical bonds that join amino acids together to form polypeptide chains are _______________ bonds.

• hydrogen

• nitrogen

• oxygen

• peptide

Polypeptide chains are long chains of amino acids joined together by _______________

• hydroxide bonds

• amino acids

• peptide bonds

• peptide adhesive

Keratin proteins are made of long chains of _______________ linked together end-to-end like beads.

• amino acids

• peptide bonds

• cross links

• polypeptide acids

What type of bond forms when the sulfur atoms in two adjacent protein chains are joined together?

• Sodium

• Calcium

• Hydrogen

• Disulfide

The action of alkaline permanent waving lotion is to soften and _______________________

• discolor the hair

• shrink the hair

• expand the hair

• condition the hair

The chemical action of ______________________ breaks the disulfide bonds through a chemical reaction called reduction.

• ammonia

• hydrogen peroxide

• waving lotion

• neutralizer

___________________ hair with a strong, resistant cuticle layer needs the additional swelling and penetration that is provided by a stronger and more highly alkaline waving solution.

• Fine

• Medium

• Curly

• Coarse

___________________ hair with a damaged cuticle layer is easily penetrated and could be further damaged by a highly alkaline permanent waving solution.

• Porous

• Medium

• Nonporous

• Coarse

The alkalinity of the perm chosen should correspond to the resistance, strength, and ________________ of the cuticle layer.

• texture

• size

• elasticity

• porosity

What is the main active ingredient or reducing agent in alkaline perms?

• Glycerol monothioglycolate

• Ammonium thioglycolate

• Hydrogen peroxide

• Sodium hydroxide