If an experiment is set up to show transformation in bacteria, what must be present in the environment for it to be successful?

Question

BlackTom AI · Accepted Answer

The question asks what must be present in the environment for a transformation experiment in bacteria to succeed. Transformation is the uptake of naked DNA from the environment by competent bacteria, leading to genetic change. 
Option 1: 'A pilus connecting two live bacterial cells.' This describes conjugation, not transformation. Conjugation requires a donor and a recipient with a pilus, but it involves direct cell-to-cell contact, not uptake of free DNA from the environment. Thus this does not describe the transformation process. 
Option 2: 'A virus capable of infecting bacterial cells.' That describes bacteriophage-mediated transduction, another method of gene transfer, not transformation. It is not required for transformation to occur. 
Option 3: 'Resistance genes released into the environment by dead cells.' This matches the classic setup for transformation: DNA released from lysed cells becomes available in the environment to be taken up by competent bacteria. The presence of extracellular DNA is essential for transformation to be possible. 
Option 4: 'Antibiotics to induce resistance mutations.' Transformation relies on uptake of external DNA, not on inducing mutations via antibiotics. While antibiotics can apply selection pressure after transformation, they are not required for the transformation event itself, and lack of selection would still permit transformation but make detection difficult. Hence this option misstates the mechanism. 
Option 5: 'A high concentration of nutrients to promote cell growth.' Nutrients promote growth, but transformation is about DNA uptake, which can occur under various conditions and is not strictly dependent on nutrient abundance. In short, rich nutrients are not a defining requirement for transformation. 
Overall, only option 3 correctly identifies the environmental condition necessary for transformation experiments: releasing DNA from dead cells into the surroundings for uptake by competent bacteria.

If an experiment is set up to show transformation in bacteria, what must be present in the environment for it to be successful? 单项选择题

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