Properties of Hair & Scalp Part 1

Hydroxide chemical relaxers break disulfide bonds and convert them to _____ bonds.

• lanthionine
• sulfur
• carbon
• hydrogen

Hair is approximately _____ percent protein.

• 30
• 50
• 70
• 90

The units of structure that build protein and are joined together end to end like pop beads are _____.

• oxygenated cells
• primary acids
• amino acids
• lymph glands

 A long chain of amino acids linked by peptide bonds is called a _____ chain.

• amino-peptide
• polymer
• keratin
• polypeptide

A physical side bond that is easily broken by water and heat is a _____ bond.

• nitrogen
• hydrogen
• disulfide
• sulfur

What type of bond is broken by wetting the hair with water and is reformed when the hair dries?

• Salt bond
• Hydrogen bond
• Disulfide bond
• Peptide bond

A weak, physical, cross-link side bond between adjacent polypeptide chains that is broken by changes in pH is a _____ bond.

• hydrogen
• carbon
• salt
• sulfur

Permanent waving and hair relaxers change the shape of hair by chemically altering the hair’s _____.

• hydrogen bonds
• ionic bonds
• disulfide bonds
• amino acids

The hair root is that portion of the hair contained within the:

• hair cuticle

• hair follicle

• sweat pore

• hair cortex

The lower part of the bulb is hollowed to fit over the:

• papilla

• root

• follicle

• shaft