PSI Barbering Practice Exam

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What is indicated by an increase in disulfide bonds in hair?

The hair becomes weaker
The hair’s resistance increases
The hair grows faster
The hair loses its color

The correct answer is: The hair’s resistance increases

An increase in disulfide bonds in hair indicates that the hair’s resistance increases. Disulfide bonds are strong links that form between sulfur atoms in the amino acids cysteine, which are found in the protein structure of hair (keratin). When these bonds increase, the overall structural integrity of the hair improves, making it more resilient and less susceptible to damage from environmental factors like heat or chemical processing. This enhanced resistance can lead to stronger, healthier-looking hair and is often the desired outcome in various hair treatments and styling techniques. The other options do not accurately reflect the implications of increased disulfide bonds. Increased disulfide bonds do not weaken the hair; rather, they bolster its strength. Additionally, the growth rate of hair is not directly influenced by disulfide bond formation, and while increased disulfide bonds do not inherently affect hair color, factors related to chemical treatments may impact pigmentation.