Which of the following scientist had developed a method of removing plasmids from the bacterial cells and reinserting them in other cells?

Options

A. Herbert Boyer and Cohen
B. Alexander Fleming
C. Stanley Cohen
D. Herbert Boyer

Answer

To solve the question, "Which of the following scientists had developed a method of removing plasmids from the bacterial cells and reinserting them in other cells?", we will analyze the options provided and identify the correct scientist based on their contributions to genetic engineering.

### Step-by-Step Solution:

1. **Understand the Question**: The question is asking for the scientist who developed a method for manipulating plasmids in bacterial cells. Plasmids are small, circular DNA molecules that can replicate independently of chromosomal DNA.

2. **Review the Options**: The options given are:
- A) Herbert Boyer and Cohen
- B) Alexander Fleming
- C) Stanley Cohen
- D) Herbert Boyer

3. **Analyze Each Option**:
- **Option A (Herbert Boyer and Cohen)**: This option suggests a collaboration between Herbert Boyer and Stanley Cohen. While both are significant figures in genetic engineering, the question specifically asks for the scientist who developed the method.
- **Option B (Alexander Fleming)**: Alexander Fleming is known for discovering penicillin, which is unrelated to plasmid manipulation. Therefore, he is not the correct answer.
- **Option C (Stanley Cohen)**: Stanley Cohen is known for his work in molecular biology, particularly for developing techniques to manipulate plasmids. He is credited with the method of removing plasmids from bacterial cells and reinserting them into other cells.
- **Option D (Herbert Boyer)**: Herbert Boyer is also a key figure in genetic engineering, particularly known for his work on recombinant DNA technology. However, he is not specifically credited with the method mentioned in the question.

4. **Identify the Correct Answer**: Based on the analysis, the correct answer is **C) Stanley Cohen**. He developed the method of removing plasmids from bacterial cells and reinserting them into other cells.

### Final Answer:
The scientist who developed a method of removing plasmids from bacterial cells and reinserting them in other cells is **Stanley Cohen**.