Which of the following is not a cloning vector ?

Options

A. Weight
B. Nuclear spin
C. Momentum
D. Potential enerrgy

Explanation

To solve the question "Which of the following is not a cloning vector?", we need to analyze the given options and determine which one does not qualify as a cloning vector.

### Step-by-Step Solution:

1. **Understand the Concept of Cloning Vectors**:
Cloning vectors are DNA molecules used to carry foreign DNA into a host cell for replication. Common examples include plasmids, bacteriophages, and cosmids.

2. **Identify the Options**:
The options given are:
- Option 1: Weight
- Option 2: Nuclear Spin
- Option 3: Momentum
- Option 4: Potential Energy

3. **Classify Each Option**:
- **Weight**: This is a vector quantity as it has both magnitude and direction (the direction is towards the center of the Earth).
- **Nuclear Spin**: This is also a vector quantity, representing the intrinsic angular momentum of particles.
- **Momentum**: This is a vector quantity as it has both magnitude and direction (mass times velocity).
- **Potential Energy**: This is a scalar quantity because it only has magnitude and no direction.

4. **Determine the Answer**:
Since the question asks for which option is not a cloning vector, we note that potential energy does not fit the definition of a cloning vector. Therefore, the correct answer is:
- **Option 4: Potential Energy** is not a cloning vector.

### Final Answer:
**Potential Energy** is not a cloning vector.

---