A genetically modified bacteria producing human insulin can be obtained by adding a human insulin gene inside the genetic material of a bacteria. Choose the next step in using the modified bacteria to treat diabetes among the following.

Options

A. Add the altered bacterium to human food.
B. Inject the altered bacterium into the blood of a person with diabetes
C. Put the bacterium into a fermenter to multiply rapidly
D. Use the altered bacterium in a nasal spray.

Answer

To solve the question regarding the next step after introducing the human insulin gene into genetically modified bacteria, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Process**: The question states that a human insulin gene has been added to the genetic material of bacteria, creating a genetically modified organism (GMO). The goal is to produce human insulin using this modified bacteria.

2. **Identifying the Next Step**: After the gene has been successfully introduced into the bacteria, the next logical step is to allow the bacteria to multiply. This is essential because we need a large quantity of bacteria to produce enough insulin.

3. **Using a Fermenter**: To achieve rapid multiplication of the bacteria, they are placed in a fermenter. A fermenter is a controlled environment where conditions such as temperature, pH, and nutrient supply can be optimized for bacterial growth.

4. **Production of Insulin**: Once the bacteria multiply, they will start producing insulin. After sufficient insulin is produced, it can be extracted and purified for medical use.

5. **Conclusion**: Therefore, the correct answer to the question is to "put the bacterium into a fermenter to multiply rapidly."

### Final Answer:
**C. Put the bacterium into a fermenter to multiply rapidly.**

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