Which of the following set is having correct statements for enzyme catalyst?
1. Each enzyme is specific for a given reaction
2. the enzyme activity is maximum at optimum pH
3. The enzymatic activity is increased in presence of certain substances called co - enzymes
4. The favourable temperature range of enzyme activity is between `50-60""^(@)C`

Options

A. 1, 3
B. 2, 3
C. 1, 2, 3
D. 1, 2, 3, 4

Answer

To solve the question regarding the correct statements for enzyme catalysts, we will evaluate each statement one by one.

### Step-by-Step Solution:

1. **Statement 1: Each enzyme is specific for a given reaction.**
- **Evaluation:** This statement is true. Enzymes are highly specific and typically catalyze only one type of reaction or act on a specific substrate. For example, the enzyme lactase specifically catalyzes the breakdown of lactose into glucose and galactose.

2. **Statement 2: The enzyme activity is maximum at optimum pH.**
- **Evaluation:** This statement is also true. Each enzyme has an optimum pH at which its activity is maximized. Deviations from this pH can lead to decreased activity or denaturation of the enzyme. For instance, pepsin works best in acidic conditions (pH around 2), while trypsin works best in slightly alkaline conditions (pH around 8).

3. **Statement 3: The enzymatic activity is increased in the presence of certain substances called coenzymes.**
- **Evaluation:** This statement is true as well. Coenzymes are non-protein molecules that assist enzymes in catalyzing reactions. They can enhance the activity of enzymes by helping in the transfer of electrons or functional groups. For example, NAD+ acts as a coenzyme in various oxidation-reduction reactions.

4. **Statement 4: The favorable temperature range of enzyme activity is between 50-60°C.**
- **Evaluation:** This statement is false. Most enzymes in the human body have an optimum temperature around 37°C (98.6°F). While some enzymes from thermophilic organisms can function at higher temperatures, the general range for human enzymes is not as high as 50-60°C.

### Conclusion:
Based on the evaluations:
- **Correct Statements:** 1, 2, and 3 are correct.
- **Incorrect Statement:** 4 is incorrect.

Thus, the set of correct statements for enzyme catalysts is **1, 2, and 3**.