What is the process by which cells take up plasmids called?

• A. Transformation
• B. Transduction
• C. Transcription
• D. Translation

Answer: (A)

The process by which cells take up plasmids is known as transformation. This is a natural method of horizontal gene transfer where a bacterium can take up free-floating DNA from its environment, particularly plasmids, which are small, circular DNA molecules that can replicate independently of chromosomal DNA. During transformation, the external plasmid DNA enters the bacterial cell, potentially conferring new traits, such as antibiotic resistance or the ability to metabolize new substances.

In contrast, transduction involves the transfer of genetic material between bacteria through bacteriophages (viruses that infect bacteria) and does not inherently involve plasmid uptake. Transcription and translation are processes related to gene expression; transcription is the synthesis of RNA from a DNA template, and translation is the synthesis of proteins from RNA. These processes do not pertain to the uptake of plasmids. Therefore, transformation is the correct answer as it specifically describes the uptake of plasmids by cells.