Read the given statements and select the correct option.
Statement 1 : Co-factors play a crucial role in the catalytic activity of the enzyme.
Statement 2: Catalytic activity is lost when co-factor is removed from the enzyme.

Options

A. Both statements 1 and 2 are correct.
B. Statement 1 is correct but statement 2 is incorrect.
C. Statement 1 is incorrect but statement 2 is correct.
D. Both statements 1 and 2 are incorrect.

Answer

To solve the question, we will analyze each statement regarding co-factors and their role in enzyme activity.

### Step-by-Step Solution:

1. **Understanding Co-factors**:
- Co-factors are non-protein molecules that assist enzymes in catalyzing reactions. They can be metal ions (like zinc or magnesium) or organic molecules (like vitamins).
- The presence of co-factors is essential for the proper functioning of many enzymes.

**Hint**: Remember that co-factors are necessary for enzyme activity and can be either metal ions or organic molecules.

2. **Analyzing Statement 1**:
- Statement 1 claims that "Co-factors play a crucial role in the catalytic activity of the enzyme."
- This statement is true because enzymes often require co-factors to achieve their active form and perform their catalytic functions.

**Hint**: Consider the relationship between enzymes and co-factors; without co-factors, many enzymes cannot function.

3. **Analyzing Statement 2**:
- Statement 2 states that "Catalytic activity is lost when co-factor is removed from the enzyme."
- This statement is also true. When a co-factor is removed from an enzyme, the enzyme reverts to its inactive form (apoenzyme), and thus loses its catalytic activity.

**Hint**: Think about what happens to the enzyme's structure and function when the co-factor is absent.

4. **Conclusion**:
- Both statements are correct. Therefore, the correct option is that both statements (1 and 2) are true.

### Final Answer:
Both Statement 1 and Statement 2 are correct. The answer is option A.