Question:
Fibrous protein is characterized by the presence of hydrogen and disulfide bonds. Examples of fibrous protein are
(A) Keratin
(B) Myosin
(C) Insulin
(D) Albumins
Choose the correct answer from the options given below:
Fibrous protein is characterized by the presence of hydrogen and disulfide bonds. Examples of fibrous protein are
(A) Keratin
(B) Myosin
(C) Insulin
(D) Albumins
Choose the correct answer from the options given below:
(A) Keratin
(B) Myosin
(C) Insulin
(D) Albumins
Choose the correct answer from the options given below:
Show Hint
Protein classifications to remember:
- Fibrous (Insoluble, rod-like): Keratin (hair, nails), Myosin (muscles), Collagen.
- Globular (Soluble, spherical): Insulin, Albumin, Hemoglobin.
- Fibrous (Insoluble, rod-like): Keratin (hair, nails), Myosin (muscles), Collagen.
- Globular (Soluble, spherical): Insulin, Albumin, Hemoglobin.
Updated On: Sep 7, 2026
- (A), (B) and (D) only
- (A) and (B) only
- (A), (B), (C) and (D)
- (C) and (D) only
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The Correct Option is B
Solution and Explanation
Concept:
Proteins are classified into fibrous and globular proteins based on their molecular shape and solubility.
- Fibrous proteins have polypeptide chains running parallel along an axis, held together by hydrogen and disulfide bonds to form fiber-like structures that are typically insoluble in water.
- Globular proteins fold their polypeptide chains into spherical shapes, making them soluble in aqueous solutions.
Step 1: Identifying Fibrous Proteins:
- Keratin (A): Keratin is an insoluble structural fibrous protein found in hair, wool, nails, horns, and feathers.
Its polypeptide chains are arranged in \(\alpha\)-helices or \(\beta\)-sheets held together by hydrogen bonds and extensive disulfide cross-linkages between cysteine residues.
- Myosin (B): Myosin is a fibrous muscle protein that functions alongside actin in muscle contraction.
Its long, fibrous tail domains form coiled-coil rods that are insoluble in water.
Hence, (A) and (B) are fibrous proteins.
Step 2: Identifying Globular Proteins:
- Insulin (C): Insulin is a globular peptide hormone composed of two polypeptide chains folded into a compact, spherical structure that is soluble in water.
- Albumins (D): Albumins (such as ovalbumin in egg white and serum albumin in blood) are globular proteins with spherical conformations that dissolve in water and dilute salt solutions.
Hence, (C) and (D) are globular proteins, not fibrous proteins.
Final Answer:
The examples of fibrous proteins are (A) and (B) only, corresponding to option (B).
Proteins are classified into fibrous and globular proteins based on their molecular shape and solubility.
- Fibrous proteins have polypeptide chains running parallel along an axis, held together by hydrogen and disulfide bonds to form fiber-like structures that are typically insoluble in water.
- Globular proteins fold their polypeptide chains into spherical shapes, making them soluble in aqueous solutions.
Step 1: Identifying Fibrous Proteins:
- Keratin (A): Keratin is an insoluble structural fibrous protein found in hair, wool, nails, horns, and feathers.
Its polypeptide chains are arranged in \(\alpha\)-helices or \(\beta\)-sheets held together by hydrogen bonds and extensive disulfide cross-linkages between cysteine residues.
- Myosin (B): Myosin is a fibrous muscle protein that functions alongside actin in muscle contraction.
Its long, fibrous tail domains form coiled-coil rods that are insoluble in water.
Hence, (A) and (B) are fibrous proteins.
Step 2: Identifying Globular Proteins:
- Insulin (C): Insulin is a globular peptide hormone composed of two polypeptide chains folded into a compact, spherical structure that is soluble in water.
- Albumins (D): Albumins (such as ovalbumin in egg white and serum albumin in blood) are globular proteins with spherical conformations that dissolve in water and dilute salt solutions.
Hence, (C) and (D) are globular proteins, not fibrous proteins.
Final Answer:
The examples of fibrous proteins are (A) and (B) only, corresponding to option (B).
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