Was gonna provide you a link to stuff that might answer your question just so I know you do the work, but... maybe somebody will answer your questions at these other websites.
http://www.premed101.com/forums/showthread.php?p=572364
http://au.answers.yahoo.com/question/index?qid=20110422055550AAlFqkh
And that was one Google search. I wouldn't be surprised if you hit the other med sites I go to, lol. Just thought it was funny how much time you put into asking these instead of just doing it. If the answers you posted are what you got, I don't see why you need to post at a bunch of places with a bunch of nothing. It's not like people post up a blank Algebra homework and ask people to post answers so they can compare their answers. <_< A quick Google search will give you answers for all of these questions, and I haven't bumped into any that is contradicting to each other.
At least you finally did give us some answers though... Vene is leading you in the right direction. You should know that just about any forum like this won't give you answers (if the questions are presented like this), just guide you to it.