Cos 1 Unit 102 Test

Which of the following statements describes how human hair is formed?

• salt bonds connect to amino acids

• hydrogen bonds create a chemical change

• bonding of protein chains to other protein chains

• amino acids cause a simple physical change

When amino acids combine to form the protein of the hair:

• the hair’s amino acid content will decrease

• they form a new amino acid group

• they take on a spiraling configuration

• the hair’s amino acid content will increase

Which bond is the backbone of all protein molecules?

• salt

• keratin

• peptide

• hydrogen

Carbon, nitrogen, oxygen, and hydrogen form the basis of:

• mixtures

• elements

• compounds

• amino acids

When two hydrogen atoms combine with one oxygen atom, the result is water, which is called a(n):

• atom

• mixture

• elements

• compounds

What is the side bond that is of the greatest concern to the salon professional?

• salt bond

• disulfide bond

• hydrogen bond

• van der Waals forces

Putting a sodium hydroxide relaxer under a hair dryer:

• will link together all protein groups

• could turn into van der Waals forces

• will increase the hair’s amino acid content

• could break the critical peptide bonds and destroy the protein structure

What makes up the primary composition of hair?

• keratin

• protons

• electrons

• trace minerals

Atoms that are different form a(n):

• atom

• mixture

• emulsion

• compound

Neutrons have which type of electrical charge?

• none

• chemical

• positive

• negative