Multiple Choice
Hair is composed largely of the fibrous protein keratin. Approximately what percentage of hair (by dry weight) is protein?
4. Protein Structure
Fibrous and Globular Proteins
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What is the most common shape for a fibrous protein?
A
Globular with multiple subunits
B
Ring-shaped
C
Spherical and compact
D
Elongated and rod-like
Verified step by step guidance1
Understand the difference between fibrous and globular proteins. Fibrous proteins are typically structural proteins, whereas globular proteins are functional and compact.
Recall that fibrous proteins are characterized by their elongated and rod-like shape, which allows them to provide structural support in tissues such as collagen in connective tissue or keratin in hair and nails.
Consider the examples of fibrous proteins, such as collagen, keratin, and elastin, which all exhibit elongated and rod-like structures to fulfill their roles in providing strength and elasticity.
Eliminate the incorrect options: 'Globular with multiple subunits,' 'Ring-shaped,' and 'Spherical and compact,' as these describe globular proteins rather than fibrous proteins.
Conclude that the most common shape for a fibrous protein is elongated and rod-like, which aligns with their structural function in the body.
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