Question

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

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

Answer 1

The Correct Option is C

The correct answer is:

Option 3: Single-stranded

Explanation:

Plasmids are small, circular, double-stranded DNA molecules that are distinct from chromosomal DNA. They are found in bacteria and can also be found in some eukaryotic organisms. Let’s review each of the options:

Circular structure: Plasmids are typically circular in structure, though some rare plasmids may be linear. This is a common feature of plasmids.

Transferable: Plasmids are often transferable between bacteria, especially via processes like conjugation, making them important in horizontal gene transfer. This is another key feature of plasmids.

Single-stranded: This is not a feature of most plasmids. Plasmids are typically double-stranded, with both strands involved in replication. Some plasmids (e.g., certain types of viral plasmids) can have single-stranded forms during their replication cycle, but this is not characteristic of all plasmids.

Independent replication: Plasmids replicate independently of the bacterial chromosome, which is a key feature that allows them to exist as separate entities in the cell.

Thus, single-stranded is not a general feature of plasmids. They are typically double-stranded.