Question

Match List-I with List-II

List-I (Protein type)	List-II (Protein example)
(A) Fibrous protein	(I) Ribosome
(B) Globular protein	(II) Casein
(C) Phosphoprotein	(III) Albumin
(D) Nucleoprotein	(IV) Keratin

Choose the correct answer from the options given below

• (A) - (I), (B) - (II), (C) - (III), (D) - (IV)
• (A) - (II), (B) - (I), (C) - (IV), (D) - (III)
• (A) - (IV), (B) - (III), (C) - (II), (D) - (I)
• (A) - (III), (B) - (IV), (C) - (I), (D) - (II)

Hint:

Conjugated proteins are named after their prosthetic group:
Phosphoprotein \(\rightarrow\) Phosphate (Casein).
Nucleoprotein \(\rightarrow\) Nucleic Acid (Ribosomes).
Glycoprotein \(\rightarrow\) Carbohydrate (Mucin).

Answer 1

The Correct Option is C

Step 1: Understanding the Concept:
Proteins are classified into different groups based on their physical structure, solubility, and chemical composition.
This classification includes simple proteins (like fibrous and globular types) and conjugated proteins (which contain non-protein prosthetic groups like phosphorus or nucleic acids).

Step 2: Detailed Explanation:
Let us analyze and match each protein type with its correct example:
1.Fibrous protein (A): These are water-insoluble, elongated, and highly stable structural proteins.
Keratin (IV) is a classic fibrous protein found in hair, wool, feathers, and hooves.
Thus, (A) matches with (IV).
2.Globular protein (B): These are water-soluble, spherical proteins that perform dynamic metabolic functions.
Albumin (III) is a classic globular protein found in egg whites and blood serum.
Thus, (B) matches with (III).
3.Phosphoprotein (C): These are conjugated proteins where phosphoric acid is chemically bound to the protein.
Casein (II) is the primary phosphoprotein found in milk.
Thus, (C) matches with (II).
4.Nucleoprotein (D): These are conjugated proteins composed of a protein combined with a nucleic acid.
Ribosomes (I) are cellular organelles composed of ribosomal RNA (rRNA) and ribosomal proteins.
Thus, (D) matches with (I).
Combining these matches gives:
\[ \text{(A)-(IV), (B)-(III), (C)-(II), (D)-(I)} \]

Step 3: Final Answer:
The correct matching sequence is (A) - (IV), (B) - (III), (C) - (II), (D) - (I).