Multiple Choice
Why is collagen insoluble?
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4. Protein Structure
Fibrous and Globular Proteins
Multiple Choice
In the context of fibrous and globular proteins, what is the primary function of keratin in vertebrates?
A
Transports oxygen in the blood via a heme-containing globular protein
B
Catalyzes peptide bond hydrolysis as a digestive protease in the stomach
C
Functions as an antibody that specifically binds antigens in the immune response
D
Provides structural strength and protective support in tissues such as hair, nails, and the outer layer of skin
Verified step by step guidance1
Identify the two main classes of proteins mentioned: fibrous and globular proteins. Understand that fibrous proteins typically provide structural support, while globular proteins often have dynamic functions like catalysis or transport.
Recall that keratin is a fibrous protein found in vertebrates, known for its role in forming tough, protective structures such as hair, nails, and the outer layer of skin.
Recognize that the other options describe functions of globular proteins: oxygen transport (e.g., hemoglobin), enzymatic activity (e.g., digestive proteases), and immune response (e.g., antibodies).
Conclude that keratin's primary function aligns with providing structural strength and protective support, consistent with the characteristics of fibrous proteins.
Summarize that keratin's role is to maintain the integrity and durability of tissues exposed to mechanical stress, rather than participating in transport, catalysis, or immune defense.
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