Which of the following is a technique for introduction of foreign gene into a cell?

Transfection refers to the introduction of foreign gene into a cell. Transfection (the delivery of DNA or RNA into eukaryotic cells) is a powerful tool used to study and control gene expression. Cloned genes can be transfected into cells for biochemical characterisation, mutational analyses, investigation of the effects of gene expression on cell growth, investigation of gene regulatory elements, and to produce a specific protein.