The most abundant protein in the animal world is :

Options

A. Trypsin
B. Hemoglobin
C. Collagen
D. Insulin

Answer

To determine the most abundant protein in the animal world from the options provided (trypsin, hemoglobin, collagen, and insulin), we can analyze each option step by step.

### Step 1: Analyze Trypsin
Trypsin is a proteolytic enzyme that helps in the digestion of proteins. While it plays a crucial role in the digestive system, it is not the most abundant protein in the animal kingdom.

**Hint:** Consider the function of trypsin and its prevalence in the body compared to structural proteins.

### Step 2: Analyze Hemoglobin
Hemoglobin is a protein found in red blood cells that is responsible for transporting oxygen throughout the body. Although it is vital for oxygen transport, it is not as abundant as other proteins in terms of total protein content in the body.

**Hint:** Think about the role of hemoglobin and how it compares to proteins that provide structural support.

### Step 3: Analyze Collagen
Collagen is known to be the most abundant structural protein in animals. It is found in the extracellular matrix and accounts for about 30% of the total protein content in the human body. Collagen provides strength, integrity, and structure to various tissues.

**Hint:** Consider the role of collagen in the body and its prevalence in connective tissues.

### Step 4: Analyze Insulin
Insulin is a hormone that regulates glucose levels in the blood. While it is important for metabolic processes, it is not abundant when compared to structural proteins like collagen.

**Hint:** Reflect on the function of insulin and its relative abundance compared to structural proteins.

### Conclusion
Based on the analysis, the most abundant protein in the animal world is **collagen**. It is essential for providing structural support and is found in various tissues throughout the body.

**Final Answer:** Collagen (Option 3)