You add 3.0 µg of plasmid DNA to a QIAprep spin miniprep purification column. You perform the binding in a binding buffer at pH 6.8. What portion (%) of the 3.0 µg of plasmid DNA would you expect to bind to the column in these conditions? What portion (%) of the bound plasmid DNA would you expect to elute using elution buffer at pH 8.5?    Make the following assumptions: • Solid phase silanol groups can have a very wide range of pKas. For the purpose of this problem, assume the silica gel functional group (silanol) in the DNA purification column matrix has a pKa of 7.5. • If a DNA molecule and column matrix functional groups have the same charge state, then that DNA molecule will be repelled and will not bind to the column. If they do not have the same charge, binding occurs.

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Scientific Notation

We have to deal with quantities that are extremely large or very small. For example- I may have 6,500,000,000 red blood cells, or the diameter of an iron atom is 0.000000011 inches. Numbers with many zeros can be inexpedient to work with, so scientists use scientific notation. It represents very large numbers or very small numbers in a simple form. We know that whole numbers can be extended to infinity, but we cannot write such large numbers on paper. Numbers that present in millions of places after the decimal point need to be represented simply. Thus, it is difficult to represent a few numbers in their extended form. Therefore, we use scientific notation.