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What is the correct meaning of a competent cell?

Answer and explanation

Correct answer: Cell prepared to take up external DNA

The direct answer is A: a cell prepared to take up external DNA. A competent cell has been treated or selected so that DNA from outside can enter it. In transformation, the external plasmid or recombinant vector is brought near the cell, and suitable conditions help it cross the cell envelope. The cell can then maintain or express the introduced DNA, depending on the vector and host. A is correct. B is wrong because competence does not mean that a cell only digests protein. C is wrong because making water is not the definition of competence. D is wrong because colouring fat has no connection with DNA uptake. Competence may be natural in some microorganisms or induced in laboratory cells; it does not mean that every cell automatically accepts every DNA molecule. Exam cue: competent = “ready for DNA entry,” and transformation = uptake of external DNA.

Related tags

Competent CellsDna UptakeTransformation

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