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Multiple Choice
Which fibrous protein is the principal component of hair and nails?
A
Elastin
B
Keratin
C
Collagen
D
Actin
Verified step by step guidance
1
Step 1: Understand the question by identifying the key terms. The question asks for the principal fibrous protein found in hair and nails. Key terms include 'fibrous protein,' 'hair,' and 'nails.'
Step 2: Recall the structural proteins in the human body. Elastin is associated with elasticity in tissues like skin and blood vessels. Collagen provides structural support in connective tissues. Actin is involved in cellular movement and muscle contraction.
Step 3: Focus on the protein specifically associated with hair and nails. Hair and nails are composed of a tough, fibrous protein that provides strength and durability.
Step 4: Identify the correct protein. Keratin is the fibrous protein that is the principal component of hair and nails. It is known for its protective and structural properties.
Step 5: Confirm your understanding by reviewing the roles of the other proteins listed. Elastin, collagen, and actin do not play a primary role in the composition of hair and nails, which confirms keratin as the correct answer.