List 4 differnt ways in which scientists can manipulate DNA?

Answer 1

In the 1980s, scientists isolated the human gene for insulin and transferred it into bacteria. Now, bacterial cultures are used to produce large amounts of human insulin. This is just one example of the many achievements possible now that we can manipulate DNA.

For other techniques and other examples of how scientists can manipulate DNA, read sources below.
http://www.carolina.com/tips/98aug/tips898a.asp?print=yes
http://www.newton.dep.anl.gov/askasci/mole00/mole00633.htm
http://www.newton.dep.anl.gov/askasci/mole00/mole00633.htm
http://www.biobasics.gc.ca/english/view.asp?x=738
http://ca.search.yahoo.com/search?ei=utf-8&fr=sfp&p=How+can+scientists+manipulate+DNA%3F&rd=r1

Answer 2

They can't unless they falsify the results. Falsification and manipulation are not the same thing.

How many ways are there to falsify results? As many ways as there are to falsify court documents or public records or surveys. It's not manipulation, it's lying to get the results you want instead of the actual results.

Edit: Soundproof is right, of course. I took this question the wrong way (having spend too much time in law enfourcement) and applied it to manipulating evidence. Sorry, my friend.