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24 questions from the barber theory practice test.
10 questions, graded as you go, with the reason for every answer. No sign-up.
Hair is built from the elements carbon, oxygen, hydrogen, nitrogen and sulfur. Which of these forms the cross-links of a disulfide bond?
D. Sulfur
A disulfide bond joins the sulfur atoms of two cysteine amino acids on neighboring protein chains. Carbon is the most abundant element in hair, but it does not form these side bonds.
Reference: Barbering theory: properties and disorders of the hair and scalp (chemical composition)
Beard hair belongs to which type of hair?
C. Terminal hair
Terminal hair is the long, coarse, pigmented hair of the scalp, beard, brows and body. Vellus hair is the short, fine, nearly colorless down found on areas such as the forehead and the bald scalp.
Reference: Barbering theory: properties and disorders of the hair and scalp (types of hair)
About how fast does healthy scalp hair grow?
B. 1/2 inch per month
Scalp hair averages about half an inch of growth a month, which is why a short haircut needs reshaping every few weeks. An inch a month would be double the normal rate.
Reference: Barbering theory: properties and disorders of the hair and scalp (hair growth)