The vectors are DNA molecules that can carry a foregin DNA segment and replicate inside the host cell. One amongst the following is not used as a vector in recombiant technology :

Options

A. Cosmid
B. Phagmid
C. Sma 1
D. MI 3

Answer

To solve the question regarding which of the following options is not used as a vector in recombinant technology, we will analyze each option provided.

### Step-by-Step Solution:

1. **Understanding Vectors**: Vectors are DNA molecules that can carry foreign DNA segments and replicate within a host cell. Common vectors include plasmids, bacteriophages, and cosmids.

2. **Analyzing the Options**:
- **Option 1: COSMID**:
- A cosmid is indeed a vector. It is a hybrid of plasmid and bacteriophage that can carry larger DNA fragments and is used in cloning.
- **Option 2: F plasmid (Fajmed)**:
- F plasmids are also vectors. They are derived from the F factor of E. coli and can be used to transfer genetic material between bacteria.
- **Option 3: SMA1**:
- SMA1 is a restriction enzyme, not a vector. Restriction enzymes are used to cut DNA at specific sequences but do not carry DNA segments themselves.
- **Option 4: M13**:
- M13 is a bacteriophage that is used as a vector in molecular cloning and is capable of carrying foreign DNA.

3. **Identifying the Correct Answer**:
- Among the options, SMA1 is the only one that is not a vector. Therefore, the correct answer to the question is **Option 3: SMA1**.

### Final Answer:
The option that is not used as a vector in recombinant technology is **SMA1**.

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