High School Biology : Proteins
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Example Questions
Example Question #1 : Understanding Specific Protein Functions
Which of the following describes a function of proteins?
All of these answers are correct
Cell signaling
Structural elements
Enzymes
Receptors
All of these answers are correct
Proteins have the most diverse functions in biological systems. Their remarkable diversity in function is due to their diversity in structure. Structural proteins, such as tubulin and collagen, have a fibrous structure that aids their function. Enzymes have active sites that allow them to bind specific molecules (substrates) and enact a conformational change to facilitate chemical reactions. Signaling proteins include several types of hormones, known as peptide hormones. Protein receptors are commonly found embedded in the cell membrane and contain active sites to bind substrates, hydrophilic regions to interact with the cell environment and extracellular space, and hydrophobic regions to interact within the lipid bilayer.
Example Question #2 : Understanding Specific Protein Functions
Which type of protein is found in hair?
Collagen
Fibrin
Myosin
Trypsin
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 #3 : Understanding Specific Protein Functions
The proteins collagen and keratin perform what function in the body?
Facilitate movement
Defend against foreign particles
Act as catalysts
Relay signals
Provide structure
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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