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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Module Assessment for Students

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