Which one of the given graphs shows the effect of pH on the velocity of a typical enzymatic reaction (V) ?

Options

A.
B.
C.
D.

Answer

To determine which graph shows the effect of pH on the velocity of a typical enzymatic reaction, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Relationship**: Enzymatic reactions are influenced by various factors, including pH. The velocity (V) of an enzymatic reaction typically varies with changes in pH.

2. **Graph Axes**: In the graph, the x-axis represents pH levels, while the y-axis represents the velocity (or rate) of the enzymatic reaction.

3. **Identify the Shape of the Graph**: The effect of pH on enzyme activity usually produces a bell-shaped curve. This means that:
- At low pH levels (acidic conditions), the enzyme activity is low.
- As pH increases, the enzyme activity rises until it reaches an optimum pH.
- Beyond this optimum pH, the enzyme activity decreases, leading to a decline in reaction velocity.

4. **Optimum pH**: The point at which the enzyme activity is at its maximum is known as the optimum pH. This is a critical feature of the graph.

5. **Select the Correct Graph**: Based on the typical bell-shaped curve described, you would look for a graph that shows:
- A rise in velocity as pH increases to a certain point (optimum pH).
- A decline in velocity as pH continues to increase beyond the optimum.

6. **Conclusion**: After analyzing the options provided, select the graph that matches the described characteristics. In this case, the correct option is option C, which depicts the expected bell-shaped curve illustrating the effect of pH on the velocity of an enzymatic reaction.

### Final Answer:
The correct graph showing the effect of pH on the velocity of a typical enzymatic reaction is option C.

---