Salt has a molar mass of 58.44 g/mol, glucose of 180.15 g/mol. 50 grams of glucose results in 278 millimoles of glucose. 9 g of sodium chloride correspond to 154 millimoles of sodium chloride. The osmolarity of the solution of sodium chloride, however, is 308 milliosmoles / liter.
In the natural world DNA usually becomes available by death and lysis of other cells, but in the laboratory it is provided by the researcher, often as a genetically engineered fragment or plasmid. During uptake, DNA is transported across the cell membrane(s) , and the cell wall if one is present.
resistance (which is used in the laboratory as a selective marker for successful. transformation) but other âgenes of interest.â If a plasmid is transformed into an E. coli. cell that is sensitive to the antibiotic ampicillin, it will confer resistance to that antibiotic. Growing the transformants in the presence of ampicillin is an easy way to select for. recombined E. coli cells.