Final answer:
Keratin and collagen are fibrous proteins, while lysozyme, hemoglobin, and actin are globular proteins. Elastin is also a fibrous protein. Understanding whether a protein is fibrous or globular helps in determining its function and role within the body.
Step-by-step explanation:
Proteins are large biomolecules composed of amino acid chains, and based on their shape and solubility, they can be classified into two major categories: globular proteins and fibrous proteins.
Globular proteins are compact, generally spherical in shape, soluble in water, and play various roles such as enzymatic, transport, and regulatory functions. Some well-known examples include enzymes like trypsin and transport proteins such as hemoglobin.
Fibrous proteins, on the other hand, consist of elongated, insoluble strands that primarily form the structural components of tissues. They include proteins like keratin found in hair and nails, collagen present in connective tissue, and elastin in ligaments and artery walls.
The following indicates whether each protein is globular (G) or fibrous (F):
- A. Keratin - F (Fibrous)
- B. Lysozyme - G (Globular)
- C. Elastin - F (Fibrous)
- D. Collagen - F (Fibrous)
- E. Hemoglobin - G (Globular)
- F. Actin - G (Globular)