All High School Biology Resources
Example Questions
Example Question #2 : Understanding Specific Protein Functions
Which type of protein is found in hair?
Collagen
Myosin
Trypsin
Fibrin
Keratin
Keratin
Keratin is a fibrous protein found in hair, nails, and the epidermis of skin. Myosin is one of the major proteins of muscle. Trypsin is an enzyme in the small intestine that helps digest proteins. Collagen is a fibrous protein found in connective tissue, such as bone and cartilage. Fibrin is a clotting protein found in the blood in response to injury.
Example Question #21 : Protein Function
The proteins collagen and keratin perform what function in the body?
Provide structure
Defend against foreign particles
Facilitate movement
Act as catalysts
Relay signals
Provide structure
Collagen in skin and keratin in hair and nails provide the body with structure. Actin and myosin are found in muscle and facilitate movement. Antibodies defend the body against microbes. Numerous enzymatic proteins, such as pepsin and lipase, act as catalysts. Peptide hormones, such as insulin and oxytocin, help relay signals in the body.
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