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.
In the next several weeks we will be inserting foreign DNA (from plants, fungi, or whatever other source you want to use) into a plasmid (pBR325), that will then be introduced into and replicated by E. coli cells for later study. I I Th.e first step in this process is to select and grow the proper strain of bacteria.