High School Biology : Protein Function

Study concepts, example questions & explanations for High School Biology

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Example Questions

Example Question #2 : Understanding Specific Protein Functions

Which type of protein is found in hair?

Possible Answers:

Collagen

Myosin

Trypsin

Fibrin

Keratin

Correct answer:

Keratin

Explanation:

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?

Possible Answers:

Provide structure

Defend against foreign particles

Facilitate movement

Act as catalysts

Relay signals

Correct answer:

Provide structure

Explanation:

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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