Which one is the cofactor of carboxypeptidase?

Options

A. Iron
B. Zinc
C. Copper
D. Magnesium

Answer

To determine the cofactor of carboxypeptidase, we can follow these steps:

### Step 1: Understand the Function of Carboxypeptidase
Carboxypeptidase is a type of enzyme known as a proteolytic enzyme, which means it helps in the breakdown of proteins. It specifically cleaves peptide bonds at the carboxyl end of amino acids.

**Hint:** Identify the type of enzyme and its role in protein digestion.

### Step 2: Define Cofactors
Cofactors are inorganic metal ions that are required by certain enzymes for their catalytic activity. They assist in the enzyme's function and can be essential for the enzyme to work properly.

**Hint:** Remember that cofactors are often metal ions that help enzymes perform their functions.

### Step 3: Analyze the Given Options
The options provided are iron, zinc, copper, and magnesium. We need to identify which of these is a known cofactor for carboxypeptidase.

**Hint:** Consider common knowledge about enzyme cofactors and their specific associations with enzymes.

### Step 4: Identify the Correct Cofactor
Research and biological knowledge indicate that carboxypeptidase requires zinc (Zn²⁺) as a cofactor for its activity. Without zinc, the enzyme cannot effectively cleave peptide bonds.

**Hint:** Recall that zinc is often mentioned in the context of various enzymes, especially proteolytic enzymes.

### Step 5: Conclusion
Based on the analysis, the correct answer to the question "Which one is the cofactor of carboxypeptidase?" is zinc (Zn²⁺).

**Final Answer:** Zinc (Zn²⁺) is the cofactor of carboxypeptidase.