DEAE-dextran is used for introduction of DNA. It is a modified _____ and is ______
(a) polysaccharide, negatively
(b) polysaccharide, positively
(c) monosaccharide, positively
(d) monosaccharide, negatively
I had been asked this question in an international level competition.
This intriguing question originated from Cultured Cells in Mammals and Restricted Areas in Intact Organisms in chapter Using Other Organisms of Genetic Engineering