Which of the following is not a feature of the plasmids ?

Options

A. Single-stranded
B. Independent replication
C. Circular structure
D. Transferable

Answer

To determine which of the following is not a feature of plasmids, let's analyze each option one by one:

1. **Single-stranded**: Plasmids are actually double-stranded DNA molecules. They are circular in shape and consist of two strands, similar to the chromosomal DNA found in bacteria. Therefore, this option is not a feature of plasmids.

2. **Independent replication**: Plasmids have the ability to replicate independently of the bacterial chromosomal DNA. This is a characteristic feature of plasmids, allowing them to multiply within the host cell.

3. **Circular structure**: Plasmids are typically circular in structure. This is another defining feature of plasmids, distinguishing them from linear DNA molecules.

4. **Transferable**: Plasmids can be transferred between bacteria through processes such as conjugation, making them transferable. This feature is important for the spread of traits such as antibiotic resistance among bacterial populations.

Based on this analysis, the option that is not a feature of plasmids is **Single-stranded**.

### Final Answer:
**Single-stranded** is not a feature of plasmids.

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