Which method can be used to introduce a cloned vector into a bacterial cell A. transcription B. transformation C. transfection D. translation

The method that can be used to introduce a cloned vector into a bacterial cell is B. Transformation.

Here's a step-by-step explanation:

1. A vector (like a plasmid) is a DNA molecule used as a vehicle to artificially carry foreign genetic material into another cell. The foreign DNA is cloned or amplified in the bacterial cells.

2. Transformation is the process of introducing foreign DNA into a cell. In this case, the vector (containing the foreign DNA) is introduced into a bacterial cell.

3. The bacterial cell takes up the vector and is now considered to be "transformed".

4. The transformed cells are then grown in a suitable medium where they replicate and express the foreign DNA.

So, the correct answer is B. Transformation.