Multiple Choice
Why is collagen insoluble?
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4. Protein Structure
Fibrous and Globular Proteins
Multiple Choice
In the context of fibrous and globular proteins, a protein substance found in nails and hair is:
A
Albumin
B
Collagen
C
Hemoglobin
D
Keratin
Verified step by step guidance1
Step 1: Understand the classification of proteins into fibrous and globular types. Fibrous proteins are typically structural, insoluble in water, and provide support and strength to cells and tissues. Globular proteins are more soluble and often function as enzymes, transporters, or regulators.
Step 2: Identify the protein substances listed and their general functions: Albumin is a globular protein mainly involved in transport in blood plasma; Collagen is a fibrous protein providing structural support in connective tissues; Hemoglobin is a globular protein responsible for oxygen transport in blood.
Step 3: Recognize that nails and hair are composed primarily of a fibrous protein that provides mechanical strength and protection. This protein is known for its high sulfur content and ability to form strong disulfide bonds.
Step 4: Recall that Keratin is the fibrous protein found in hair, nails, and the outer layer of skin, characterized by its tough, insoluble nature and structural role.
Step 5: Conclude that among the options given, Keratin is the correct protein substance found in nails and hair, distinguishing it from Albumin, Collagen, and Hemoglobin.
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