**Core Concept**
Plasmids are small, self-replicating circular DNA molecules found in bacteria, often conferring antibiotic resistance or other advantageous traits. They are distinct from the bacterial chromosome and can be easily transferred between cells through processes like conjugation, transformation, or transduction.

**Why the Correct Answer is Right**
Plasmids are known for their ability to replicate independently of the bacterial chromosome, often using their own replication origins and enzymes. This allows them to maintain a high copy number within the cell, facilitating the expression of genes they carry. Plasmids can also be engineered to express specific genes, making them valuable tools in molecular biology and gene therapy.

**Why Each Wrong Option is Incorrect**
**Option A:** Plasmids can be found in archaea, but this is not a false statement regarding plasmids in general.
**Option B:** Plasmids can be transferred between cells through conjugation, transformation, or transduction, which is true. However, the question asks for a false statement, so this option is not the correct answer.
**Option C:** Plasmids are not found in eukaryotic cells, which makes this a false statement regarding plasmids. Eukaryotic cells have their own chromosomes and do not typically harbor plasmids.

**Clinical Pearl / High-Yield Fact**
Plasmids have been engineered to produce various therapeutic proteins, such as insulin and growth hormone, making them valuable tools in gene therapy and biotechnology.

**Correct Answer: C. Plasmids are not found in eukaryotic cells.**