Overview

The Origin
of Hair

Topic 1: Structures of
the Hair

Topic 1 Activity

Topic 1 Summary

Topic 2: The Layers of the Hair

Topic 2 Activities

Topic 2 Summary

Topic 3: Chemical Composition of Hair

Topic 3 Activities

Topic 3 Summary

Module Assessment

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Answer Key for Module Assessment

1. As living cells of the hair mature, they fill up with a protein called:

a.      sebum

b.      keratin*

c.      melanin

d.      lanugo

2. The elements that make up the amino acids in hair are carbon, nitrogen, hydrogen:

a.      sulfur and chlorine

b.      copper and oxygen

c.      oxygen and sulfur*

d.      oxygen and sodium

3. Of the five elements in human hair, the element that makes up the highest percentage is:

a.      oxygen

b.      sulfur

c.      hydrogen

d.      carbon*

4. The chemical bonds that join amino acids to each other are called:

a.      peptide bonds*

b.      side bonds

c.      hydrogen bonds

d.      salt bonds

5. The bonds that account for the strength and elasticity of hair are the:

a.      side bonds*

b.      peptide bonds

c.      polypeptide chains

d.      end bonds

6. There are three different types of side bonds in the cortex:

a.      polypeptide, hydrogen and salt bonds

b.      salt, hydrogen and peptide bonds

c.      hydrogen, salt and disulfide bonds*

d.      disulfide, bisulfide and salt bonds

7. A disulfide bond joins the ___ atoms of two neighboring cysteine amino acids to create cystine.

a.      carbon

b.      hydrogen

c.      nitrogen

d.      sulfur*

8. Disulfide bonds can be broken by:

a.      shampoo

b.      heat

c.      perms and relaxers*

d.      water

9. The three phases of hair growth are anagen, catagen and:

a.      growth phase

b.      biogen

c.      transition

d.      telogen*

10. The three layers of the hair shaft are the cuticle, cortex and:

a.      follicle

b.      bulb

c.      root

d.      medulla*