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Why is collagen insoluble?
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4. Protein Structure
Fibrous and Globular Proteins
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Hair is composed largely of the fibrous protein keratin. Approximately what percentage of hair (by dry weight) is protein?
A
90%
B
50%
C
10%
D
25%
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Understand that hair is primarily made up of keratin, which is a fibrous structural protein.
Recall that the dry weight of hair excludes water content, focusing on the solid components such as proteins, lipids, and minerals.
Recognize that keratin constitutes the majority of the dry weight of hair, as it forms the structural framework.
From biochemical knowledge, estimate that the protein content (keratin) in hair by dry weight is very high, typically around 80-90%.
Conclude that the approximate percentage of protein in hair by dry weight is closest to 90%, reflecting its composition mainly of keratin.
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