Keratin and collagen are examples of which type of proteins?

• A. Fibrous proteins
• B. Enzymatic proteins
• C. Globular proteins
• D. Membrane proteins

Answer: (A)

Verified step by step guidance

1. Understand the types of proteins: Proteins can be categorized into different types based on their structure and function, such as fibrous proteins, globular proteins, enzymatic proteins, and membrane proteins.
2. Learn about fibrous proteins: These proteins are typically elongated and insoluble in water. They provide structural support and strength to cells and tissues. Examples include keratin (found in hair, nails, and skin) and collagen (found in connective tissues like tendons and ligaments).
3. Compare fibrous proteins to other types: Globular proteins are spherical and soluble in water, often functioning as enzymes, hormones, or transport molecules. Enzymatic proteins specifically catalyze biochemical reactions, while membrane proteins are embedded in cell membranes and assist in transport or signaling.
4. Identify the correct category: Based on their structural role and insolubility, keratin and collagen are classified as fibrous proteins.
5. Review the answer choices: Match the description of keratin and collagen to the correct option, which is 'Fibrous proteins.'