Which of the following is not correct for enzyme catalysis?

Options

A. The enzyme activity is maximum at optimum pH which is between 5-7
B. Each enzyme is specific for a given reaction.
C. The favourable temperature range of enzyme activity is between `50-60^(@)C` .
D. The enzymatic activity is increased in presence of certain substances called co-enzymes.

Explanation

To determine which statement is not correct regarding enzyme catalysis, we will analyze each of the provided statements step by step.

### Step-by-Step Solution:

1. **Statement 1: Enzyme activity is maximum at optimum pH which is 5 to 7.**
- Enzymes generally have an optimum pH range where they function best. Most enzymes operate effectively in a slightly acidic to neutral pH, typically between 5 and 7. Thus, this statement is **correct**.

2. **Statement 2: Each enzyme is specific for a reaction.**
- Enzymes are known for their specificity; each enzyme catalyzes a specific reaction or type of reaction. For example, the enzyme maltase specifically catalyzes the hydrolysis of maltose into glucose. Therefore, this statement is also **correct**.

3. **Statement 3: The favorable temperature range of enzyme activity is 50-60 degrees Celsius.**
- Enzymes are sensitive to temperature changes. While they can function at various temperatures, most enzymes have an optimal temperature range that is typically much lower than 50-60 degrees Celsius. High temperatures can denature enzymes, leading to loss of function. Therefore, this statement is **incorrect**.

4. **Statement 4: Enzyme activity increases in the presence of certain coenzymes.**
- Coenzymes are non-protein molecules that assist enzymes in catalyzing reactions. They can enhance the activity of enzymes, making this statement **correct**.

### Conclusion:
The statement that is not correct regarding enzyme catalysis is **Statement 3**, which claims that the favorable temperature range for enzyme activity is 50-60 degrees Celsius.

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