Define transformation in the context of bacterial experiments.

Define transformation in the context of bacterial experiments.

• A. A transcription event where DNA is copied into RNA.
• B. The uptake and incorporation of external genetic material into a cell, leading to heritable change.
• C. A mutation caused by environmental factors.
• D. Protein synthesis guided by DNA.

Answer: (B)

Transformation in bacteria is the uptake of naked DNA from the environment by a competent cell and the stable incorporation or maintenance of that genetic material, resulting in a heritable change in genotype (and potentially phenotype). This means the new genes can be passed on to future generations, either by recombination into the chromosome or by existing as a replicating plasmid. It’s a classic example of horizontal gene transfer and underlies how bacteria can acquire new traits, such as antibiotic resistance, from other organisms. This differs from transcription, which is the process of copying DNA into RNA, and from translation, which is protein synthesis guided by RNA. It also differs from mutations caused by environmental factors, which are changes in DNA sequence not necessarily acquired through uptake of external DNA.

Transformation in bacteria is the uptake of naked DNA from the environment by a competent cell and the stable incorporation or maintenance of that genetic material, resulting in a heritable change in genotype (and potentially phenotype). This means the new genes can be passed on to future generations, either by recombination into the chromosome or by existing as a replicating plasmid. It’s a classic example of horizontal gene transfer and underlies how bacteria can acquire new traits, such as antibiotic resistance, from other organisms. This differs from transcription, which is the process of copying DNA into RNA, and from translation, which is protein synthesis guided by RNA. It also differs from mutations caused by environmental factors, which are changes in DNA sequence not necessarily acquired through uptake of external DNA.