Which one of the given graphs shows the effect of temperature on the velocity of a typical enzymatic reaction ?

Options

A.
B.
C.
D.

Answer

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

### Step-by-Step Solution:

1. **Understanding the Relationship**:
- Enzymatic reactions are influenced by temperature. Generally, as temperature increases, the rate of reaction (or velocity) also increases, up to a certain point.

2. **Graph Axes**:
- On the x-axis, we will plot temperature, and on the y-axis, we will plot the rate of reaction (velocity).

3. **Low Temperature Effect**:
- At low temperatures, the rate of reaction is low because the enzyme activity is reduced. This means that the graph starts at a lower point on the y-axis.

4. **Increasing Temperature**:
- As we increase the temperature, the rate of reaction increases. This is due to the increased kinetic energy of molecules, which leads to more frequent collisions between enzymes and substrates.

5. **Optimal Temperature**:
- There is an optimal temperature range where the rate of reaction reaches its maximum. This peak represents the highest velocity of the enzymatic reaction.

6. **High Temperature Effect**:
- Beyond this optimal temperature, the rate of reaction begins to decrease. This is because high temperatures can denature enzymes, causing them to lose their functional shape and thus reducing their activity.

7. **Final Graph Shape**:
- The resulting graph will typically show a rise in the rate of reaction as temperature increases, reaching a peak at the optimal temperature, and then a decline as the temperature continues to rise.

8. **Identifying the Correct Graph**:
- Based on this understanding, we can identify that the correct graph will resemble a bell-shaped curve, starting low, peaking at an optimal temperature, and then declining.

### Conclusion:
- The graph that best represents the effect of temperature on the velocity of a typical enzymatic reaction is **Option C**, which illustrates the described bell-shaped curve.