Colorado Cosmetology Written Practice Exam

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Which type of bonds make permanent waving, curl reforming, and chemical hair relaxing possible?

Disulfide bonds
Peptide bonds
Pyrimidine bonds
Sulfhydryl bonds

The correct answer is: Disulfide bonds

Disulfide bonds are the correct answer because they are responsible for the shape and structure of keratin proteins in hair. Peptide bonds are incorrect as they are responsible for linking amino acids together to form proteins. Pyrimidine bonds are incorrect as they are present in DNA and RNA, not hair. Sulfhydryl bonds are incorrect as they are involved in protein folding and maintaining structure, but not specifically for the types of hair treatments mentioned in the question.