Plasmids and viruses are most commonly used vectors. Write True or False.

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The statement to evaluate is "Plasmids and viruses are most commonly used vectors." We need to determine if this statement is true or false.

2. **Defining Vectors**: In biotechnology, a vector is a DNA molecule used to carry foreign genetic material into another cell. Vectors are essential for gene cloning and genetic engineering.

3. **Explaining Plasmids**: Plasmids are small, circular, double-stranded DNA molecules that are separate from chromosomal DNA. They are found in bacteria and can replicate independently. Plasmids are commonly used as vectors because they can carry foreign DNA and replicate within a host cell.

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