In which of the following pair, both the proteins are same type, fibrous or globular?

Options

A. myosin, albumin
B. insulin, collagen
C. keratin, fibroin
D. albumin, myosin

Explanation

To determine which pair of proteins consists of the same type (either both fibrous or both globular), we need to analyze the types of proteins mentioned in the options.

### Step-by-Step Solution:

1. **Understand the Types of Proteins:**
- **Fibrous Proteins:** These proteins are long, narrow strands and generally serve structural roles. Examples include collagen and keratin.
- **Globular Proteins:** These proteins are spherical or rounded in shape and typically have functional roles, such as enzymes and hormones. Examples include albumin and insulin.

2. **Identify the Proteins in the Given Options:**
- **Myosin:** This is a fibrous protein that plays a role in muscle contraction.
- **Albumin:** This is a globular protein that functions primarily in maintaining osmotic pressure and transporting substances in the blood.
- **Insulin:** This is a globular protein that functions as a hormone to regulate blood sugar levels.
- **Collagen:** This is a fibrous protein that provides structural support in connective tissues.
- **Keratin:** This is a fibrous protein found in hair, nails, and skin.
- **Fibroin:** This is a fibrous protein, commonly found in silk.

3. **Analyze the Pairs:**
- **Pair 1: Myosin and Albumin:** Different types (Myosin is fibrous, Albumin is globular).
- **Pair 2: Insulin and Collagen:** Different types (Insulin is globular, Collagen is fibrous).
- **Pair 3: Keratin and Fibroin:** Same type (Both are fibrous proteins).

4. **Conclusion:**
- The only pair where both proteins are of the same type is **Keratin and Fibroin**, as both are fibrous proteins.

### Final Answer:
The pair in which both proteins are the same type (fibrous) is **Keratin and Fibroin**.

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