See more pictures of alternative fuel vehicles. You've probably heard about fuel cells. In 2003, President Bush announced a program called the Hydrogen Fuel Initiative (HFI) during his State of the Union Address.
Phenol-Chloroform Extraction. Purpose: Phenol-chloroform extractions are done when you need to purify DNA from a solution that also has proteins. The DNA will dissolve in the aqueous layer, and everything else will go into the non-aqueous layer.. Phenol:chloroform. 1  Add one equal volume of phenol:chloroform:IAA (found in 4C in room 263) to DNA solution. 2  The phenol:chloroform solution has two layers â be sure to take the bottom layer!!! 3  Mix gently; spin for 5 minutes at max speed. 4  Remove aqueous layer (top layer) to a new tube.
Best Answer: 1. PCR is used to amplify DNA: that is, to (exponentially) increase the number of molecules of a particular DNA region. And because PCR uses primers, it can isolate a particular DNA sequence of interest from among an enormous, complex mix of millions of various DNA sequences: you can proverbially find the DNA needle in a haystack. 2. PCR is important because it allows scientists to work with DNAs and DNA samples that they previously could not.