Hair Structure and Properties Assessment

Hair is primarily composed of keratin, a protein made of amino acids. The structure and properties of hair are influenced by chemical components and bonds within keratin. Amino acids determine hair properties, while peptide bonds form the protein backbone. Side bonds, including disulfide, hydrogen, and salt bonds, affect hair's strength and flexibility. Hair color is determined by melanin pigments, eumelanin and pheomelanin, which give hair its unique color. The interplay of these elements gives hair its elasticity, strength, and color.

What is the primary protein that makes up hair?

• Collagen

• Keratin

• Myosin

• Elastin

How do amino acids influence the properties of hair?

• By making hair waterproof

• By affecting the hair's strength and flexibility

• By determining the hair's color

• By increasing hair growth rate

What role do peptide bonds play in the structure of keratin?

• They link amino acids together in a protein chain

• They are responsible for hair's elasticity

• They make hair resistant to water

• They provide color to the hair

Which type of bond is the strongest among the side bonds in hair?

• Salt bonds

• Peptide bonds

• Hydrogen bonds

• Disulfide bonds

What is the main contribution of hydrogen bonds in hair?

• Increasing hair growth

• Maintaining the overall shape of the protein

• Providing color

• Making hair waterproof

Which bond type contributes to the overall stability of the protein structure in hair?

• Disulfide bonds

• Hydrogen bonds

• Salt bonds

• Peptide bonds

What primarily determines the elasticity and strength of hair?

• The thickness of the hair strand

• The amount of melanin

• The arrangement of various bonds within keratin

• The length of the hair

Which pigment is responsible for brown and black hair colors?

• Chlorophyll

• Carotene

• Eumelanin

• Pheomelanin

What pigment contributes to red and blonde hair colors?

• Pheomelanin

• Carotene

• Eumelanin

• Hemoglobin

How is the color of hair determined?

• By the number of hair follicles

• By the thickness of the hair strand

• By the distribution of melanin pigments

• By the length of the hair